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Question

Physics Question on Capacitors and Capacitance

The capacity of a condenser is 4×10−64\times {{10}^{-6}} farad and its potential is 100 volts. The energy released on discharging it fully will be:

A

0.04 J

B

0.02 J

C

0.025 J

D

0.05 J

Answer

0.02 J

Explanation

Solution

The energy released on discharging the capacitor fully, is given by E=12CV2=12×4×10−6×(100)2E=\frac{1}{2}C{{V}^{2}}=\frac{1}{2}\times 4\times {{10}^{-6}}\times {{(100)}^{2}} =2×10−2=0.02 J=2\times {{10}^{-2}}=0.02\,J