In the shown capacitor network, the charge on the left plate of the 5 μF capacitor is -20 μC. Find the charge on the right plate of the 3 μF capacitor.
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Question

In the shown capacitor network, the charge on the left plate of the 5 μF capacitor is −20 μC. Find the charge on the right plate of the 3 μF capacitor.

G1 Physics · Accepted Answer

The isolated internal conductor junctions must have zero net charge. Use equal potential difference for the 3 μF and 4 μF parallel branches and charge neutrality of each floating node. Solving gives charge on the specified 3 μF plate = +60/7 μC ≈ +8.57 μC. Correct answer: A.