Question

A 4$\mu F$ capacitor is charged to 400V and then the plates are joined through a 1000 ohm resistor. The heat produced in the resistor is :

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

Answer 1

The correct option is B 0.32 J

Energy lost as heat through the resistor equals the energy stored in the capacitor.
$Heat=1/2\times 4\times {10}^{-6}\times 160000\Rightarrow H=0.32J$