AP Physics C: Electricity and Magnetism MCQs
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AP Physics C: Electricity and Magnetism practice questions by unit
Fiveable has 8,839 AP Physics C: Electricity and Magnetism multiple-choice practice questions across 6 units, plus 153 stimulus-based question sets built around a source. Practice one unit or topic at a time.
- Unit 8 – Electric Charges & Fields: Gauss's Law: 1,784 multiple-choice questions, 30 stimulus sets
- Unit 9 – Electric Potential: 601 multiple-choice questions, 14 stimulus sets
- Unit 10 – Conductors and Capacitors: 958 multiple-choice questions, 26 stimulus sets
- Unit 11 – Electric Circuits: 2,451 multiple-choice questions, 40 stimulus sets
- Unit 12 – Magnetic Fields & Electromagnetism: 1,533 multiple-choice questions, 16 stimulus sets
- Unit 13 – Electromagnetic Induction: 1,512 multiple-choice questions, 27 stimulus sets
Sample AP Physics C: Electricity and Magnetism practice question
A battery with internal resistance r is connected to a load resistor R. When R = r, the fraction of the total power generated by the battery that is delivered to the load is 0.50. If the load resistance is increased to R = 3r, what is the new fraction of power delivered to the load?
The fraction increases from 0.50 to 0.75
The fraction increases from 0.50 to 1.00
The fraction decreases from 0.50 to 0.25
The fraction decreases from 0.50 to 0.33
Explanation
Deriving the efficiency function n = P_load / P_total = (I^2 R) / (I^2 (R+r)) = R/(R+r) allows for prediction of the new value. Substituting R = 3r yields n = 3r/(3r+r) = 3/4 = 0.75. This demonstrates that efficiency increases as load resistance increases relative to internal resistance.
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