Q.

In the arrangement of capacitors shown in Fig. 3.61, the capacitors are initially uncharged,  and now are connected with switch S open. Find the potential of point b and the amount  of charge flowing through the switch, when it is closed :

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a

66.7 V, 300 μC

b

66.7 V, 400 μC

c

100 V, 300 μC

d

133.3 V, 400 μC

answer is C.

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Detailed Solution

When switch S is openTotal capacity of circuit = 4 μFTotal charge stored = 200 x 4 μC = 800 μCWhere switch S is closedIt is clear that potential of point b = 100 Vand charge flown through S = 200 + 100 = 300 μC
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In the arrangement of capacitors shown in Fig. 3.61, the capacitors are initially uncharged,  and now are connected with switch S open. Find the potential of point b and the amount  of charge flowing through the switch, when it is closed :