Question

A $4\mu F$ conductor is charged to 400 volts and then its plates are joined through a resistance of $1k\Omega$. The heat produced in the resistance is

• A. 0.16 J
• B. 1.28 J
• C. 0.64 J
• D. 0.32 J

Answer 1

Answer: (D)

0.32 J

Answer 2

Heat produced = Energy stored in capacitor

$= \frac{1}{2}CV^{2} = \frac{1}{2} \times 4 \times 10^{- 6} \times (400)^{2} = 0.32J$