AP Physics C Electricity and Magnetism Flashcards: Conservation Of Electric Energy

Study Conservation Of Electric Energy in AP Physics C Electricity and Magnetism with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

QUESTION

State the formula for energy stored in a magnetic field.

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ANSWER

$U = \frac{1}{2}LI^2$ . Energy stored in magnetic field of inductor.

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AP Physics C Electricity and Magnetism: Electric Potential

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What this deck covers

This deck focuses on Conservation Of Electric Energy, giving you a quick way to review the definitions, rules, and examples that matter most for AP Physics C Electricity and Magnetism.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Practice questions

1 of 8Practice questions for this set

12\,\text{V}

ideal battery charges a

C=200\,\mu\text{F}

capacitor through a resistor

R=300\,\Omega

; after a long time, the capacitor reaches

12\,\text{V}

. The capacitor then disconnects from the battery and discharges through the same resistor in a closed loop. During discharge, charge moves through a potential difference, so capacitor potential energy decreases and becomes thermal energy in

R

(via brief carrier kinetic energy). The initial discharge energy is

U_0=\tfrac12 C V^2=\tfrac12(200\times10^{-6})(12^2)=1.44\times10^{-2}\,\text{J}

. With

RC=0.060\,\text{s}

, after

t=0.030\,\text{s}

U_C=U_0 e^{-2t/RC}=U_0 e^{-1}\approx5.30\times10^{-3}\,\text{J}

, so

9.1\times10^{-3}\,\text{J}

has been converted to heat while total energy remains conserved. Based on the scenario, how does the energy stored in the capacitor change as it discharges?

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