A parallel plate capacitor is connected to a battery. The plates are pulled apart with uniform speed. If x is the separation between the plates, then the rate of change of electrostatic energy of the capacitor is proportional to
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a
x2
b
x
c
1x
d
1x2
answer is D.
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Detailed Solution
The capacitance of capacitor C is ε0A/x.Charge on capacitor q=CV=ε0AVx; U=12qV=12ε0AV2xSo dUdt=12ε0AV2-1x2dxdt=12ε0AV2v-1x2From the earlier expressions,dUdt∝1x2