A $4\, \,\mu F$ condenser is charged to $400\, V$ and then its plates are joined through a resistance. The heat produced in the resistance is.......$J$
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(b) $U = \frac{1}{2}C{V^2} = \frac{1}{2} \times 4 \times {10^{ - 6}} \times {(400)^2} = 0.32\,J$
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