AP Physics C Electricity and Magnetism review: format, units, and how to study

What’s on the AP Physics C: E&M exam

The exam splits evenly into two sections. Section I is 42 multiple-choice questions in 1 hour 25 minutes, worth 50%, asked as discrete items and as sets built around a diagram, graph, or data set. Section II is 4 free-response questions in 1 hour 35 minutes, also 50%, where you write out full calculus-based solutions by hand. The whole exam runs 3 hours.

The four free-response questions each target a different skill: working a mathematical routine, translating between representations, designing or analyzing an experiment, and moving between qualitative and quantitative reasoning. A calculator and the official equation sheet are allowed on both sections — our AP Physics C E&M equation sheet shows exactly what you are given. The format is hybrid: the multiple choice and prompts are in Bluebook, while your free-response work is handwritten in a paper booklet.

The 6 units of AP Physics C: E&M

The redesigned course covers six units. They are numbered 8 through 13 because the Physics C sequence continues from the seven Mechanics units — so a syllabus that opens at “Unit 8” is not missing anything. Electrostatics and circuits carry the most weight.

How AP Physics C: E&M is scored

Your multiple-choice and free-response points combine into one composite score, which the College Board scales to a 1–5 each year. E&M is consistently one of the highest-scoring AP exams: in 2025, 72.9% of students scored a 3 or higher and 25.2% earned a 5, following a 2024 cohort where 71.6% passed and 35.2% earned a 5.

Do not read that as an easy exam. The cohort is small and self-selecting — typically strong physics and math students taking it after or alongside Mechanics — so the high pass rate reflects preparation, not a gentle test. To see what a practice raw score turns into, run it through our AP Physics C: E&M score calculator.

How to study for AP Physics C: E&M

Command the calculus, because the big laws are integrals. Gauss’s law, Ampère’s law, and Faraday’s law are all statements about integrals, and the exam rewards setting them up correctly and exploiting symmetry — knowing when a spherical, cylindrical, or planar Gaussian surface makes the integral trivial is worth more than any memorized result.

Then practice deriving rather than recalling. Since the equation sheet is provided, points come from choosing the right relationship and justifying the setup, so work past free-response questions under a timer and keep our equation sheet open until the symbols and setups feel automatic. Field-and-potential problems and circuit analysis repay the most practice.

AP Physics C: E&M vs Mechanics — which is harder?

Most students find E&M the harder of the two. Mechanics deals with motion you can picture — blocks, ramps, collisions — while E&M works with invisible fields and leans more heavily on the calculus, especially the integral forms of Gauss’s and Ampère’s laws. It is also usually taken second, so the pace assumes you already have Mechanics-level fluency.

The two are separate exams with separate scores, and many students sit both in the same year. If you are planning that, our AP Physics C Mechanics review covers the companion course and its seven units.

When is the AP Physics C: E&M exam, and how long is it

AP Physics C: Electricity and Magnetism is given once a year during the College Board’s May testing window, and the exam takes 3 hours. It is commonly scheduled on the same day as Physics C: Mechanics, so students taking both sit them back to back. The exact date and start time are set each year, so confirm the current schedule on the official AP calendar with your coordinator before you plan around it.