A capacitor stores 60 μC when connected to a battery. A dielectric is inserted while the capacitor remains connected, and 120 μC additional charge flows through the battery. The dielectric constant is:
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Question

A capacitor stores 60 μC when connected to a battery. A dielectric is inserted while the capacitor remains connected, and 120 μC additional charge flows through the battery. The dielectric constant is:

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G1 Physics · Accepted Answer

Initially Q₀=60 μC. After insertion an additional 120 μC flows, so Qf=180 μC. At fixed battery voltage, Q∝C∝K. Thus K=Qf/Q₀=180/60=3. Correct answer: C.