First slide

Capacitance

Question

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 :

Moderate

A

66.7 V, 300 μC
B

66.7 V, 400 μC
C

100 V, 300 μC
D

133.3 V, 400 μC

Solution

When switch S is open
Total capacity of circuit = 4 μF
Total charge stored = 200 x 4 μC = 800 μC
Where switch S is closed
It is clear that potential of point b = 100 V
and charge flown through S = 200 + 100 = 300 μC

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