Quick answer: the AP Physics C: Electricity and Magnetism exam is now about 3 hours — but that comes with a big scheduling change. It used to be just 90 minutes, taken back-to-back with Physics C: Mechanics in a single afternoon. A recent redesign roughly doubled its length and split the two Physics C exams onto separate days. This page gives you the current timing breakdown, the before-and-after, why the two Physics C exams are no longer combined, and how to pace the most calculus-heavy AP physics exam — so you walk in knowing exactly how the clock works.
The direct answer: the AP Physics C: E&M exam now runs about 3 hours of testing, in two sections with a short break between. Section I (multiple choice, 50%): 40 questions in 80 minutes (~2 min each), done digitally in Bluebook. Section II (free response, 50%): 4 questions in 100 minutes (~25 min each), handwritten. The big change: this exam used to be just 90 minutes total (35 MCQ/45 min + 3 FRQ/45 min), taken back-to-back with Mechanics in one afternoon — the redesign roughly doubled it and split the two Physics C exams onto separate days, each a full-length exam in its own session. The free-response section (100 min) is longer than the multiple-choice section (80 min), since each FRQ demands extended calculus derivations. Per-question time is more comfortable now, but E&M’s heavy calculus and abstract, multi-step questions can still make it tight. With check-in, plan to be on-site closer to 3.5–4 hours — and if taking both Physics C exams, that’s two separate days. The timing changes again for May 2027 — confirm your year. Full breakdown below.
For the full part-by-part breakdown of what’s tested and how it’s scored, see the AP Physics C: E&M exam format guide. Taking both Physics C exams? See how long the Mechanics exam is (same timing, different day). And estimate your score with the AP score calculator.
What this guide covers
The short answer
Let’s state the number plainly, then unpack what it’s made of — because this exam’s length and scheduling both recently changed a lot. About 3 hours across two sections.
The AP Physics C: E&M exam is now about 3 hours of actual testing time. That total is split into two sections with a short break between them. Section I (multiple choice) is 40 questions in 80 minutes and worth 50% of your score. Section II (free response) is 4 questions in 100 minutes and worth the other 50%. Add the two section times (80 + 100 = 180 minutes) and you get the 3-hour figure — not counting the break or the administrative time around the exam. The word “now” matters, because this is a recent and significant change: before the redesign, AP Physics C: E&M was one of the shortest AP exams, at just 90 minutes total, and it was taken back-to-back with Physics C: Mechanics in a single afternoon. Three clarifications on the current exam. First, this is testing time only: the actual time at the test site is longer (check-in, instructions, and the break all add to it). Second, the two sections are weighted equally at 50% each, even though one has 40 questions and the other has 4. Third, the free-response section is longer than the multiple-choice section (100 vs. 80 minutes) — worth understanding (below). One important note on currency: the College Board has announced the timing will be updated again starting with the May 2027 exam (moving toward a slightly different multiple-choice count and section timing), so if you’re testing then or later, confirm the current numbers. So the precise answer to “how long is the AP Physics C: E&M exam” is about 3 hours of testing across two equally-weighted sections — a big jump from its old 90-minute length — on its own day, with the real-world commitment closer to four hours. The rest of this page breaks those minutes down.
The number to remember: ~3 hours of testing — Section I is 40 multiple-choice questions in 80 minutes (50%), Section II is 4 free-response questions in 100 minutes (50%) — plus a short break that isn’t counted. This roughly doubled from the old 90-minute exam, and E&M is now on its own day, no longer paired with Mechanics. Plan to be at the test site closer to 3.5–4 hours.
Section-by-section timing
Here’s where the 3 hours actually goes — the breakdown that matters for pacing. Two sections, very different shapes.
The exam’s two sections have distinct timing, question counts, and even formats. Section I (multiple choice, 50%) is 40 questions in 80 minutes — about 2 minutes per question — completed digitally in the Bluebook app. The questions are single-select with four answer choices, appearing as discrete questions or in sets sharing a stimulus (a field diagram, circuit, graph, or data). Section II (free response, 50%) is 4 questions in 100 minutes — about 25 minutes per question, though each has multiple parts — and is handwritten in a paper booklet. A key point: the two sections are separately timed, so you can’t carry unused time from the multiple choice into the free response or vice versa. A calculator is allowed and an equation sheet provided on both sections. The table lays out the full timing at a glance.
| Section | Questions | Time | Per question | Weight |
|---|---|---|---|---|
| Section I — Multiple choice (digital) | 40 | 80 min | ~2 min | 50% |
| Section II — Free response (handwritten) | 4 | 100 min | ~25 min | 50% |
| Total | 44 | ~3 hours | — | 100% |
Plus a short break between sections (not counted). Calculator + equation sheet on both. Roughly doubled from the old 90-minute exam, now on its own day (separate from Mechanics). The MCQ count and timing change for May 2027; confirm with the College Board.
Why the two Physics C exams split onto separate days
The most distinctive thing about AP Physics C: E&M timing isn’t just that it got longer — it’s that the two Physics C exams are no longer combined. Here’s the before-and-after. From one shared afternoon to two separate days.
Here’s the story behind the change, which is bigger for E&M than a simple length increase: before the recent redesign, both AP Physics C exams were only 90 minutes each — 35 multiple-choice questions in 45 minutes and 3 free-response questions in 45 minutes — and they were taken back-to-back on the same day, often in a single afternoon session (you could sit Mechanics and then E&M in one sitting). The redesign, effective with the 2024–25 school year, roughly doubled each exam’s length to about 3 hours (the multiple-choice section went to 40 questions in 80 minutes and the free-response section went to 4 questions in 100 minutes) and, crucially, split the two Physics C exams onto separate days, each in its own dedicated full-length session. Because each exam is now a full 3 hours, they can no longer be squeezed into the same window. The reasoning: to give students more time per question and to reflect that E&M (like Mechanics) is a full college-semester course in its own right, not half of one. The practical implications are important, especially if you’re taking both. First, the exam is now the same length as AP Physics 1 and 2. Second, if you’re looking at older resources describing a 90-minute exam or Physics C exams taken back-to-back, that information is out of date. Third — the big one — if you’re taking both Physics C exams, they’re now on two separate days, each a full 3-hour exam, so you should plan for two separate testing commitments on different dates rather than one combined afternoon. Check the official AP exam schedule for the specific dates. For the full rundown of the format changes, see the AP Physics C: E&M exam guide, and for overall dates, the AP exam schedule.
Why the free-response section is longer
Within the current exam, the free-response section gets more time than the multiple-choice section — here’s why. Time follows the calculus derivations.
The free-response section (100 minutes) is longer than the multiple-choice section (80 minutes) because free-response questions require much more time per question — even though there are only 4 of them versus 40 multiple-choice questions. Each free-response question is multi-part and asks you to show extended work: deriving expressions for fields and potentials (using Gauss’s law or integration), performing multi-step calculations, designing experiments, analyzing data, and writing out reasoning and justifications. Because E&M is the most calculus-heavy AP Physics exam, this work takes real time — setting up a Gauss’s law integral or a Biot–Savart calculation isn’t quick. The design reflects the exam’s emphasis on demonstrating physics-and-calculus reasoning rather than speed. The practical meaning of the extra time (about 25 minutes per free-response question) is that you have room to set up the calculus and reason carefully and show your complete derivation, which is where partial credit is earned. So the longer free-response section is a feature that rewards thorough, well-explained calculus work over rushing. It does mean the free-response section carries a lot of weight per question, so budgeting your time across the four questions matters. For what each free-response question asks, see the AP Physics C: E&M format guide.
The break and the format switch
One short break sits at the midpoint, and it doubles as the moment you switch formats. A pause, and a change of tools.
There’s a short break between Section I and Section II — typically around 10 minutes — that is not counted in the roughly 3 hours of testing time. After you finish the multiple-choice section, you get this brief break before starting the free-response section. It’s a good moment to rest and reset before the free-response section, which requires sustained reasoning and lengthy calculus derivations. Beyond that single break, the time within each section runs continuously, so be prepared to work through the 80-minute multiple-choice section and then the 100-minute free-response section without stopping. As with the other AP Physics exams, there’s a format detail here: because the multiple choice is digital (in Bluebook) and the free response is handwritten (on paper), the break is also when you shift between those two formats — from working on a screen to writing derivations in a booklet. Knowing that transition is coming helps you settle into the free-response section smoothly. For the full digital-format details, see whether AP exams are digital.
Why the timing can still feel tight
The redesign gave this exam much more time, but the heavy calculus means pacing still matters. More time, demanding questions.
The redesign gave AP Physics C: E&M much more time than before, so the per-question timing is now more comfortable: about 2 minutes per multiple-choice question and about 25 minutes per free-response question. Even so, many students find the time can still be tight, because E&M is the most calculus-heavy AP Physics exam and the questions are often multi-step and abstract. A single multiple-choice question might require setting up a Gauss’s law integral or computing a field — which takes longer than a quick calculation — and the free-response derivations can be lengthy. So even with the extra time, you can lose your margin on a few heavy questions. The keys to good pacing follow directly: keep moving; don’t go strictly in order (solve the quicker questions first, then flag and return to the harder multi-step ones); and budget your free-response time deliberately across the four questions (roughly 25 minutes each). The single most effective thing, though, is thorough preparation: the more fluent your vector calculus and E&M concepts, the faster you work through each question, and the more the extra time actually feels like enough. In short, the redesign’s extra time genuinely helps, but the demanding, calculus-heavy content still rewards good pacing and strong preparation. This connects to why the exam is challenging overall, covered in the difficulty guide once it’s live.
How long you’ll actually be at the test site
The testing time and your real time commitment are two different numbers, and it helps to plan for the larger one — times two if you’re taking both Physics C exams. Budget around four hours per exam.
While the testing time is about 3 hours, the total time you’ll spend at the test site is longer — typically closer to three and a half or four hours once everything is included. The extra time comes from several sources: arriving early, check-in and seating, the proctor reading instructions and getting everyone set up (including the digital multiple-choice section in Bluebook and calculators), the break between sections, and wrap-up at the end. None of this counts toward the 3 hours of testing, but all of it counts toward your day. The big E&M-specific point: because E&M is now in its own dedicated testing session on a separate day from Mechanics, if you’re taking both Physics C exams, that’s two separate roughly four-hour commitments on different dates — not one combined afternoon like the old format. The practical takeaways: plan each exam day around roughly a four-hour commitment; eat beforehand; make sure your testing device is charged (and bring a power cord) and your calculator is ready; and if you have afternoon commitments, give yourself a buffer. For everything else to prepare for the day, see what to bring on AP exam day, and to confirm the specific dates for both Physics C exams, the AP exam schedule.
Multiple choice — ~2 minutes per question. 40 questions in 80 minutes. Don’t go strictly in order — solve quicker questions first, flag the multi-step calculus ones (Gauss’s law, field setups) to return to. Answer every question; no penalty for wrong answers.
Free response — ~25 minutes per question. 4 questions in 100 minutes. Budget deliberately so one derivation doesn’t eat another’s time. Use the time to set up the calculus and show complete work — that’s where partial credit lives.
Taking both Physics C exams? Two separate days. Mechanics and E&M are no longer back-to-back — plan for two full ~3-hour exams (closer to four hours on-site each) on different dates. Check the schedule.
Practice with the real clock. The only way this pacing feels natural is to practice full timed sections in the split digital/handwritten format before exam day. See the practice guide.
How long is the AP Physics C: E&M exam: frequently asked questions
How long is the AP Physics C: E&M exam?
Now about 3 hours of actual testing time, not counting check-in, instructions, and the break. It’s divided into two sections with a short break in between. Section I, multiple choice, is 40 questions in 80 minutes and worth 50%. Section II, free response, is 4 questions in 100 minutes and also worth 50%. This is a significant change: before the recent redesign, AP Physics C: E&M was one of the shortest AP exams, at just 90 minutes total (45 minutes for multiple choice and 45 for free response), and it shared a single afternoon with Physics C: Mechanics. The redesign roughly doubled its length and made it a full-length exam in its own testing session on a separate day. With administrative time before and around the exam, plan to be at the test site noticeably longer than 3 hours, typically closer to three and a half or four hours. Note that the timing is scheduled to be updated again starting with the May 2027 exam, so confirm the current timing for your exam year.
How long is each section of the AP Physics C: E&M exam?
Each section is worth 50% of your score. Section I is the multiple-choice section: 40 questions in 80 minutes, about 2 minutes per question. Section II is the free-response section: 4 questions in 100 minutes, about 25 minutes per question, though each question has multiple parts. The free-response section (100 minutes) is longer than the multiple-choice section (80 minutes), even though it has far fewer questions, because the free-response questions require extended reasoning, calculus derivations, and written explanations that take more time per question. The multiple-choice section is completed digitally in the Bluebook app, while the free-response section is handwritten in a paper booklet. There’s a short break between the two sections that isn’t counted in the testing time. Both sections allow a calculator and provide an equation sheet.
Are AP Physics C: Mechanics and E&M still on the same day?
No, not anymore. This is one of the biggest scheduling changes from the recent redesign. Previously, AP Physics C: Mechanics and AP Physics C: Electricity and Magnetism were each only 90 minutes long and were taken back-to-back on the same day, often in a single afternoon session. With the redesign, both exams were roughly doubled in length to about 3 hours each and made into full-length exams in their own separate testing sessions on different days. So if you’re taking both Physics C exams, they are now on two separate days, each a full 3-hour exam, rather than one combined afternoon. This means you should plan for two separate roughly 3-hour testing commitments (closer to four hours each at the test site), on different dates, rather than one longer combined session. Check the official AP exam schedule for the specific dates, since Mechanics and E&M are scheduled on different days.
Did the AP Physics C: E&M exam get longer?
Yes, significantly. Before the recent redesign, AP Physics C: E&M was one of the shortest AP exams, at only 90 minutes total: 35 multiple-choice questions in 45 minutes and 3 free-response questions in 45 minutes, and it shared a testing session with AP Physics C: Mechanics. The redesign, effective with the 2024-25 school year, roughly doubled the exam’s length to about 3 hours: the multiple-choice section went to 40 questions in 80 minutes, and the free-response section went to 4 questions in 100 minutes. It also became a full-length exam in its own dedicated testing session on a separate day from Mechanics. The idea was to give students more time per question and to reflect that E&M is a full college-semester course in its own right. So if you’re looking at older resources that describe a 90-minute exam or Physics C exams taken back-to-back, that information is out of date; the current E&M exam is about 3 hours on its own day.
Is the AP Physics C: E&M exam timing tight?
The redesign gave AP Physics C: E&M much more time than before, so the per-question timing is now more comfortable: about 2 minutes per multiple-choice question and about 25 minutes per free-response question. However, many students still find the time can be tight, because E&M is the most calculus-heavy AP Physics exam and the questions are often multi-step and abstract. A single multiple-choice question might require setting up a Gauss’s law integral or computing a field, which takes longer than a quick calculation, and the free-response derivations can be lengthy. The keys to good pacing are to keep moving, not go strictly in order (solve the quicker questions first and flag the harder multi-step ones to return to), and budget your free-response time deliberately across the four questions. Thorough preparation helps most: the more fluent your vector calculus and E&M concepts, the faster you work. The extra time from the redesign genuinely helps, but the demanding, calculus-heavy content still rewards good pacing.
How much time should I spend at the AP Physics C: E&M test site?
While the testing time is about 3 hours, plan to be at the test site longer, typically closer to three and a half or four hours total. The extra comes from arriving early, checking in and seating, the proctor reading instructions and setting up (including the digital multiple-choice section in Bluebook and calculators), the break, and wrap-up. None counts toward the 3 hours of testing, but all counts toward your day. Importantly, because AP Physics C: E&M is now in its own dedicated testing session on a separate day from Mechanics, if you’re taking both Physics C exams, that’s two separate roughly four-hour commitments on different dates, not one combined afternoon. So schedule each exam day around a roughly four-hour commitment, eat beforehand, make sure your testing device is charged and your calculator is ready, and give yourself a buffer if you have anything planned afterward.
The quick version
The AP Physics C: E&M exam is now about 3 hours of testing time, in two sections with a short break between them (the break isn’t counted). Section I, multiple choice, is 40 questions in 80 minutes (about 2 minutes each), completed digitally in Bluebook, and worth 50%. Section II, free response, is 4 questions in 100 minutes (about 25 minutes each), handwritten on paper, and also worth 50%. Both sections allow a calculator and provide an equation sheet. The big change worth knowing: this exam used to be one of the shortest APs, just 90 minutes total, and was taken back-to-back with Physics C: Mechanics in a single afternoon. The redesign roughly doubled each exam’s length and split the two Physics C exams onto separate days, each a full-length exam in its own session. So if you’re taking both, they’re now on two different dates. The free-response section is longer than the multiple-choice section because the calculus-heavy derivations take more time. The extra time is more comfortable, but E&M’s heavy calculus and abstract, multi-step questions can still make pacing tight. With check-in, plan to be at the test site closer to four hours per exam. Note: the timing changes again for May 2027.
Practice with the real clock, then estimate your score with the free AP score calculator. See the full AP Physics C: E&M format, the practice guide, how long the Mechanics exam is (same timing, different day), the AP exam schedule, or what to bring on exam day.
Accuracy note: AP Physics C: E&M exam timing, structure, and scheduling are set by the College Board and can change — the exam was recently restructured (roughly doubling in length and splitting from Mechanics onto a separate day), and notably, the number of multiple-choice questions and the timing for each section will be updated starting with the May 2027 exam. The times and dates here reflect the current exam for general informational purposes only. Always confirm the exact current timing, format, and exam dates on the College Board’s official AP Physics C: Electricity and Magnetism exam page and AP exam schedule before test day, especially if testing in May 2027 or later.
The College Board’s AP Physics C: E&M exam page lists the official section structure and timing, and notes upcoming changes. AP Physics C: E&M exam →
The College Board’s AP exam calendar shows the specific dates, including the separate days for the two Physics C exams. AP exam calendar →
