Question

13. A capacitor with a capacitance of 20 mkF is charged to a potential of 100 V. Find the energy of this capacitor.

Answer 1

Solution

capacitance of C=20 mF

Potential V=180V

So energy in this capacitor

$U=0.5CV^2$

Putting all vaues

So energy in capacitor

$U=20\times10^6\times100\times100\\=2\times10^{11}J.$