1.

If the charge in a capacitor is 4C and the energy stored in it is 4J, calculate the voltage across its plates.(a) 2V(b) 4V(c) 8V(d) 16V

Answer» Correct option is (a) 2V

The best I can explain: The expression for finding the value of energy is:

U=Q^2/2C.

Substituting the values of U and Q, we get C=2F.

V=Q/C, hence V=4/2=2V.


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