AP Physics C: Electricity and Magnetism
Free AP Physics C: E&M practice built around the mistakes students actually make. Calculus-based, all 31 topics across units 8 to 13. Every topic ships a lesson built around the specific errors students actually make, and a ten-scenario skill check where each wrong answer is one of those errors, named and corrected.
Learn
Lessons built from the mistakes
01 · Learn
Topic lessons
One per CED topic, 31 in all. Each opens on the distinction the topic actually turns on, then works the cases where students reliably go wrong, and closes with a ten-scenario skill check.
Browse the units02 · Diagnose
Topic diagnostic
Short topic-level assessments built around documented student misconceptions. Each result routes you to the specific drills that fix what tripped you up.
Start a diagnostic03 · Verify
Cumulative MCQ
Twenty-item per-unit exams that mirror AP Physics C format. Use as a baseline before a unit test or as a final check after drills.
Take a cumulativeBy unit
Jump into a unit
Reference
Resources and guides
Arcade
Mistake Master Blaster
One arcade game per unit. Fire at the right answer; wrong shots wake the misconception you fell for.
Tool
Score Calculator
Estimate your 1 to 5 from MCQ and FRQ raw scores.
Reference
Reference Sheet
The E&M equation and constant sheet, with calculus, geometry, and exam conventions.
Guide
FRQ Guide
The four task types, scoring patterns, and what each FRQ rewards.
Overview
Exam Format
Sections, timing, calculator policy, unit weightings, and the 2027 date.
Framework
All 6 Units
Units 8 to 13 with approximate exam weighting and topic counts.
Difficulty
Is AP Physics C: E&M Hard?
What actually makes it tough and what to do about it.
Hub
Practice Modes
All three practice modes with guidance on when to use each.
Diagnose
Topic Diagnostics
Every topic's ten-item diagnostic, indexed by unit.
Why the units start at 8
The College Board treats Physics C as one framework in two halves: Mechanics is units 1 through 7, Electricity and Magnetism is units 8 through 13. The numbering here matches AP Classroom exactly, so a unit number on this site is the unit number your teacher uses. If you are looking for units 1 through 7, they are in AP Physics C: Mechanics.
Why misconception-targeted, not problem volume
Working more problems only helps if the wrong ones get corrected. This course is organised the other way around: 114 documented errors, catalogued per unit, each with the mistaken step written out and the correction beside it. Every distractor in every skill check is one of those errors producing its own number, so choosing it tells you exactly which idea to repair rather than that you missed.