Question

>.Capacitor is to have an energy content of 20J it
must be placed across a potential difference of
A. 4 volts
C. 2 volts
B. 9 volts
D. 1 vol
solution please​

Answer 1

Answer:

Explanation:

The question is incomplet. There is no value of capacitance. But for your understanding, if u put 1 you will get ~6 value which is not in option. In given option you will get 2volts answer only when you put C=10f. So according to me 2 volt is best option.

Answer 2

Answer:

A.

Explanation:

"Capacitor" here means  the question states its value 1Farad.

Energy stored = 0.5 $CV^{2}$

20 = 1* $V^{2}$

V= $\sqrt[]{20}$ ~ =4.47 Volts (approx)