AP Physics C Electricity & Magnetism FRQ Practice 2027: 124 Questions
Four original free-response questions for every topic, aligned to the four current task types and paired with response workspaces, saved attempts and transparent self-grading.
Choose topic and task type
Every topic includes MR, TBR, Experimental Design & Analysis, and QQT. Write the response before opening the rubric.
Four-question structure built into every topic bank
Why the self-grader is transparent
The grader does not assign an opaque machine score to physics prose. It checks for potentially relevant evidence terms, then reveals the actual practice-rubric checkpoints. You decide whether your written response satisfies each checkpoint and receive a 0–10 practice score plus the missed evidence categories.
Explanations, examples, interactive tools and study organization are original Salar Cafe content. AP® is a registered trademark of College Board, which is not affiliated with or endorsing this site.
AP Physics C: Electricity and Magnetism free-response methods
For May 2027, E&M has four FRQs in 95 minutes (50% of the composite). Calculus-based work may involve electric-field integration, Gauss’s law, capacitors, circuit differential equations, magnetic flux and induction. A diagram should identify charge signs, current direction and symmetry before any integration.
Worked capacitor problem
For an ideal parallel-plate capacitor with plate area A, separation d and vacuum between plates, C=ε₀A/d. If the plate separation doubles while area remains fixed, C halves. With the capacitor disconnected after charging, Q remains fixed and stored energy U=Q²/(2C) doubles. If it stays connected to an ideal fixed-voltage source instead, stored energy U=(1/2)CV² halves. The boundary condition is therefore essential.
Faraday’s law reasoning
Induced emf is ε=−dΦB/dt for a one-turn circuit with the chosen orientation. The negative sign encodes Lenz’s law: the induced response opposes the change in flux. The sign convention depends on how the loop’s positive orientation is defined.
Experimental practice
Propose an experiment varying plate separation while keeping area and geometry fixed; measure capacitance repeatedly, plot C against 1/d, and explain fringing and stray-capacitance effects. Interpret slope and units rather than reporting correlation alone.
Original educational practice, not official College Board questions.