AP Physics C: E&M Study Guide: Units 8–13 & 2027 Exam
Use the current six-unit sequence, official exam weights, May 2027 format, and linked calculus-based topic notes to plan AP Physics C: Electricity and Magnetism. This guide replaces the older five-unit numbering still found in many legacy study plans.
What AP Physics C: Electricity and Magnetism covers
AP Physics C: Electricity and Magnetism is a semester-long, calculus-based introductory college physics course. Students develop models for electric charge, electric and magnetic fields, electric potential, capacitance, circuits, induction, and electromagnetic behavior. Calculus connects local field behavior to accumulated effects and helps describe changing charge and current.
College Board recommends a calculus course taken previously or concurrently. Students should also have completed a calculus-based Newtonian mechanics course such as AP Physics C: Mechanics. Vector components, derivatives, integrals, algebra, and trigonometry appear throughout the course.
Start with the AP Physics C: Mechanics study guide if you need the first half of the sequence. For an algebra-based route through electricity and magnetism, compare the AP Physics 2 notes and study guides. The AP subjects directory can help you compare the wider course lineup.
The AP Physics C: E&M units for 2026–27
The official ranges below describe the approximate share of scored multiple-choice questions. Free-response problems may connect several units, especially fields, potential, circuits, magnetism, and induction.
Unit 8: Electric Charges, Fields, and Gauss's Law
Use Coulomb's law, superposition, continuous charge distributions, electric flux, and Gauss's law. Symmetry determines when a Gaussian surface makes the analysis useful.
Review electrostatics and electric fieldsUnit 9: Electric Potential
Connect potential difference, potential energy, work, field, and equipotential surfaces. Use the relationship between electric field and the spatial change of potential.
Connect electric fields and potentialUnit 10: Conductors and Capacitors
Analyze electrostatic equilibrium, shielding, capacitance, dielectrics, stored energy, and combinations of capacitors. State whether charge or voltage remains fixed.
Study capacitor models and energyUnit 11: Electric Circuits
Model current, resistance, power, Kirchhoff's rules, and transient behavior in RC circuits. Translate among a circuit diagram, differential equation, graph, and physical explanation.
Practice calculus-based circuit analysisUnit 12: Magnetic Fields and Electromagnetism
Analyze forces on charges and currents, particle trajectories, torque on loops, Biot–Savart and Ampère's laws, and magnetic-field sources.
Build the magnetic-field frameworkUnit 13: Electromagnetic Induction
Use magnetic flux, Faraday's law, Lenz's law, motional emf, inductance, and LR circuits. A sign should communicate how the induced effect opposes the change that produced it.
Review inductance and changing currentAP Physics C: E&M exam format for May 2027
The 2027 exam is scheduled for Wednesday, May 5, 2027, Session 2. It is hybrid digital: students answer multiple-choice questions and view free-response prompts in Bluebook, then handwrite free-response solutions in a paper booklet.
| Section | Questions | Time | Score |
|---|---|---|---|
| Section I: Multiple Choice | 42 | 85 minutes | 50% |
| Section II: Free Response | 4 | 95 minutes | 50% |
The four free-response questions assess mathematical routines, translation between representations, experimental design and analysis, and qualitative/quantitative translation. A permitted calculator may be used on both sections, and reference information is supplied. Show integration limits, directions, sign conventions, and relevant physical laws rather than presenting an unexplained result.
Electric-field calculator
Use this preserved study tool for the magnitude of the electric field produced by one point charge in vacuum. The result gives magnitude; determine direction separately from the sign of the source charge and the observation point.
A practical AP Physics C: E&M study plan
1. Draw the geometry
Define coordinates, source locations, symmetry, field direction, loop orientation, and sign conventions before integrating.
2. Link representations
Move among field maps, equipotentials, circuit diagrams, flux graphs, equations, and verbal predictions.
3. Explain the physics
After calculating, state how the result depends on distance, geometry, material, or time and whether its limiting behavior is reasonable.
Use laboratory work to develop exam skills
AP Physics C courses should devote at least 25 percent of instructional time to hands-on investigations. Keep a lab notebook or digital portfolio with the question, apparatus, measured quantities, raw data, graphs, uncertainty, conclusion, and improvements. Useful E&M investigations include mapping equipotentials, measuring RC time constants, testing resistivity, and connecting induced emf to changing magnetic flux.
Build a strong error-correction cycle
- Separate errors in physical model, calculus, algebra, sign convention, representation, experiment design, and time management.
- Derive symbolically before substituting values, then check units and limiting cases.
- Mix electrostatics with potential and magnetism with induction so you learn to select a law without a chapter cue.
- Use older released questions carefully: they remain useful, but some no longer align completely with the revised course and exam structure.
Official sources and update notes
- College Board: AP Physics C: E&M course, units, weights, and CED
- College Board: May 2027 exam date and format
- College Board: 2026–27 course and laboratory requirements
- College Board: released E&M questions and scoring information
Editorial note: This guide was reviewed against official College Board information on September 22, 2026. Schools may sequence material differently, and exam policies can change; verify final exam-day details with your AP coordinator and College Board.