Q.

A variable condenser is permanently connected to a 100 V battery. If the capacity is changed from 2 μF to 10 μF, then change in energy is equal to

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a

2 x 10-2 J

b

2.5 x 10-2 J

c

3.5 X 10-2 J

d

4 X 10-2 J

answer is D.

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Detailed Solution

ΔU=U2-U1=V22C2-C1 =(100)22(10-2)×10-6=4×10-2 J
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A variable condenser is permanently connected to a 100 V battery. If the capacity is changed from 2 μF to 10 μF, then change in energy is equal to