Question

Two capacitors each of $1 \mu F$ capacitance are connected in parallel and are then charged by 200 volts d.c. supply. The total energy of their charges (in joules) is

• A. 0.01
• B. 0.02
• C. 0.04
• D. 0.06

Answer 1

Answer: (C)

0.04

Answer 2

$U = \frac { 1 } { 2 } C V ^ { 2 } = \frac { 1 } { 2 } \times 2 \times ( 200 ) ^ { 2 } \times 10 ^ { - 6 } = 0.04 J$