Q. A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system :
A) increases by a factor of 4
B) decreases by a factor of 2
C) remains the same
D) increases by a factor of 2
Explanation
[Solution] Charge Q is shared over 2C: $U' = Q^2/(4C) = U/2$. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.