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In the circuit shown, $C_{1} = C_{2} = 2 μ F .$ Capacitor $C_{1}$ is charged to 50 V and $C_{2}$ is charged to 20 V. After charging, they are connected as shown. When $S_{1}, S_{2} a n d S_{3}$ are closed,

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70 $μ C$ of charge will pass through $S_{1}$

100 $μ C$ of charge will pass through $S_{1}$

70 $μ C$ of charge will pass through $S_{3}$

40 $μ C$ of charge will pass through $S_{3}$

answer is A, C.

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Detailed Solution

When switches are open, charges on the capacitor are shown.

When switches are closed, capacitors become parallel; charges are shown on two capacitors. Comparing two diagrams, it is clear that $70 μ C$ of charge will pass through switches $S_{1} a n d S_{3}$

Hence, choices (1) and (3) are correct and choices (2) and (4) are
wrong.

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