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Question

Consider the circuit shown in figure, after switch S is closed. What amount of charge will flow through the switch?

155426_f5178670dcfb4d9b9815e2571cad8edc.png

A
20μC
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B
60μC
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C
40μC
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D
no charge will flow
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Solution

The correct option is B 60μC
Figure (a) corresponds to when switch is open.
Figure (b) corresponds to when switch is closed.
Various charges flowing after closing the switch are as follows:
Δq1=6040=20μC
Δq2=200=20μC
Δq3=200=20μC
Δq4=Δq1+Δq2+Δq3=60μC
172570_155426_ans_140aeb7885ea48b89f4f313a29b03e8c.png

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