Question

A 12µF capacitor is required to store 4J of energy. Find the p.d to which the capacitor must be charged.

Answer 1

$E=4$ J

$C=12\times 10^{-12} \mu F$

$E={\frac {CU^2} 2}$

$U=\sqrt{{\frac {2E} C}}=8.2\times10^5 V$