Question

A capacitor is charged through a potential difference of 200 V, when 0.1 C charge is stored in it. The amount of energy released by it, when it is discharged is

• A. 5J
• B. 10 J
• C. 20 J
• D. 2.5 J

Answer 1

Answer: (B)

10 J

Answer 2

: Here, $V = 200V,q = 0.1C.$

Energy stored, $U = \frac{1}{2}qV$

$= \frac{1}{2} \times 0.1 \times 200 = 10J$

When the capacitor is discharged, it releases the same amount of energy i.e., 10J.