The plates of a parallel plate capacitor are given charges +4Q and -2Q. The capacitor is then connected across an uncharged capacitor of same capacitance as first one (= C). Find the final potential difference between the plates of the first capacitor.
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Question

The plates of a parallel plate capacitor are given charges +4Q and -2Q. The capacitor is then connected across an uncharged capacitor of same capacitance as first one (= C). Find the final potential difference between the plates of the first capacitor.

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G1 Physics · Accepted Answer

Use the RC relation q = CE(1−e^(−t/τ)) or q = q₀e^(−t/τ), with τ = R(th)C. The result matches A (3Q/2C).

The plates of a parallel plate capacitor are given charges +4Q and −2Q. The capacitor is then connected across an uncharged capacitor of same capacitance as first one (= C). Find the final potential difference between the plates of the first capacitor.