Electric potential quiz for AP Physics C: 10 questions with answers

by aicko
28 October 202628 October 2026

Quick answer: Electric potential is potential energy per unit charge, V = U/q, measured in volts. This AP Physics C quiz checks electric potential with 10 multiple-choice questions and instant feedback; every answer comes with a short explanation.

Electric potential quiz for AP Physics C: 10 questions with answers

This electric potential quiz for AP Physics C has quick multiple-choice questions with instant feedback. Need a refresher first? Read the lesson or do the worksheet on electric potential.

Choose the best answer for each of the ten questions. Each has one correct option. Read the explanation after you answer, especially when you pick one of the options that mix up potential, field and energy.

Level: AP Physics C (Mechanics and E&M, calculus-based) · Curriculum: AP PC:E&M Unit 9

Contents

Electric potential quiz: the questions

Which expression gives the potential at distance r from a point charge q?

What is the SI unit of electric field expressed using the volt?

A positive charge moves in the direction of the field. What happens to its potential energy?

On the axis of a ring with total charge Q, V at distance x is

Which statement about a conductor in electrostatic equilibrium is correct?

A V–x graph has a slope of −50 V/m. What is E?

Two connected conducting spheres of different sizes have equal

Equipotential lines drawn closer together show

Which integral gives the potential difference between a and b?

The potential at the centre of a hollow charged conducting shell of radius R is

Definition of electric potential? — Potential energy per unit charge, V = U/q.

Unit of potential? — Volt, 1 V = 1 J/C.

Potential of a point charge? — V = kq/r, zero at infinity.

Field from potential? — E = −dV/dx (minus the slope).

Potential difference from field? — ΔV = −∫E·dl.

Which way does E point? — Toward decreasing potential.

Equipotentials versus field lines? — They are perpendicular.

Field inside a conductor in equilibrium? — Zero; the conductor is one equipotential.

Potential of a ring on its axis? — V = kQ/√(x² + R²).

Energy gained by charge q through ΔV? — ΔK = qΔV.

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