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Question

the left most capacitor is uncharged. the other two capacitor carry charges q1=8μC and q2=10μC. Now switch S is closed. Find the final charge on the leftmost capacitor.
1058153_9ca95e9a64b1423bb41ff71de5b91a6c.PNG

A
3μC
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B
6μC
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C
12μC
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D
18μC
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Solution

The correct option is A 3μC
When switch 1 closed other 2 capacitors are initially charged, But all have equal capacity of 6μF So Voltage drop across must be equal to 2V.
q=CV=62μF=3μC

1425709_1058153_ans_aea2df33249741a9ac7b86c7a6c41e1b.png

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