Question

A cylindrical capacitor has charge Q and length L. If both the charge and length of the capacitors are doubled, by keeping other parameters fixed, the energy stored in the capacitor –

• A. Remains same
• B. Increases two times
• C. Decreases two times
• D. Increases four times

Answer 1

Answer: (B)

Increases two times

Answer 2

U = , C =

\ U µ $\frac { \mathrm { Q } ^ { 2 } } { \ell }$ \ C µ l