Question

A battery does 50J of work in charging a capacitor. The energy stored in the capacitor is ??

With Explanation.

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Answer 1

Given:

A battery does 50J of work in charging a capacitor.

To find:

The energy stored in the capacitor is ??

Solution:

From given, we have,

A battery does 50J of work in charging a capacitor.

We use the formulae:

W = qv .....(1)

where,

W = work done in charging a capacitor

q = total charge used

v = voltage

U = 1/2 qv ......(2)

U = energy stored in a capacitor

q = total charge used

v = voltage

using equations (1) and (2), we get,

U = 1/2 W

from given, W = 50 J

U = 1/2 × 50 = 25

∴ The energy stored in the capacitor is 25 J.

Answer 2

Answer:

Explanation:

Work done by battery=CV*V=50J

energy stored in capacitor=(1/2)CV*V=25J