A simple pendulum has a length l and the mass of the bob is m. The bob is given a charge q coulomb. The pendulum is suspended between the vertical plate of a charged parallel plate capacitor. If E is the electric field strength between the plates, the time period of the pendulum is given by

Options

A. `2pisqrt(l/(sqrt(g-(qE)/m)))`
B. `2pisqrt(l/(sqrt(g^2-((qE)/m)^2))`
C. `2pisqrt(l l g)`
D. `2pisqrt(l/(sqrt(g+(qE)/m))`

Answer

B