Question

Two condensers, each of capacitance $1\mu F$, are connected in parallel. These are charged by a DC source of 200 volt. The total energy of their charges in joule will be

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

Answer 1

Answer: (B)

0.04

As two capacitors are connected in parallel, the equivalent capacitance of the system is
$C_{eq}=C+C=2\mu F$
Energy stored in this system is $U=\frac{1}{2}{C}_{eq}{V}^2=\frac{1}{2}\times 2\times {10}^{-6}\times (200{)}^2=0.04J$