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  1. AP Physics C E M
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Electric Circuits

Question 1
Physics C: E&M (2025)APExam Style
1 mark

A charge moves through an electric potential difference of ΔV\Delta VΔV. What is the change in electric potential energy, ΔUE\Delta U_{\mathrm{E}}ΔUE​, experienced by the charge?

Question 2
Physics C: E&M (2025)APExam Style
1 mark

In a two-loop circuit, the potential rises in the first loop is 20V and the potential drops are due to a 4Ω\OmegaΩ and a 6Ω\OmegaΩ resistor. In the second loop, there is a 5V battery and three resistors with 2Ω\OmegaΩ, 4Ω\OmegaΩ and 8Ω\OmegaΩ. Which of the following equations correctly represents Kirchhoff's Loop Rule ...

Question 3
Physics C: E&M (2025)APExam Style
1 mark

Consider a two-loop circuit with two batteries and three resistors. After applying Kirchhoff's Loop Rule and the Junction Rule, you obtain the following system of equations:

I1=I2+I3I_1 = I_2 + I_3I1​=I2​+I3​ 10 - 2I_1 - 4I_2 = 0 −4I2+5−3I3=0-4I_2 + 5 - 3I_3 = 0−4I2​+5−3I3​=0

If I2=1AI_2 = 1AI2​=1A, what is the value of I1I_1I1​?

Question 4
Physics C: E&M (2025)APExam Style
1 mark

What fundamental principle underlies Kirchhoff's Loop Rule?

Question 5
Physics C: E&M (2025)APExam Style
1 mark

A circuit consists of a 12V battery connected in series with a 4Ω resistor and a 2Ω resistor. What is the voltage drop across the 4Ω resistor?

Question 6
Physics C: E&M (2025)APExam Style
1 mark

Consider a complex multi-loop circuit. After applying both the Loop and Junction rules, you arrive at the following system of equations:

I1=I2+I3I_1 = I_2 + I_3I1​=I2​+I3​ 12 - 4I_1 - 2I_2 = 0 6 - 3I_3 + 2I_2 = 0

Solve for I1I_1I1​, I2I_2I2​, and I3I_3I3​.

Question 7
Physics C: E&M (2025)APExam Style
1 mark

An electric potential vs. position graph for a circuit loop shows a sudden increase in potential, followed by a gradual decrease. What circuit elements are likely present at these locations?

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Question 8
Physics C: E&M (2025)APExam Style
1 mark

A circuit consists of a battery and a resistor. Which of the following graphs best represents the electric potential vs. position around the loop, starting from the negative terminal of the battery?

Question 9
Physics C: E&M (2025)APExam Style
1 mark

In a circuit with multiple loops and junctions, which of the following statements correctly applies both the loop and junction rules?

Question 10
Physics C: E&M (2025)APExam Style
1 mark

In a simple circuit containing a 9V battery and a single resistor, what is the voltage drop across the resistor according to Kirchhoff's Loop Rule?