Question

A simple pendulum of length L is placed between the plates of a parallel plate capacitor having electric field E, as shown in figure. Its bob has mass m and charge q. the time period of the pendulum is given by

Answer 1

Answer:

OptionA

Explanation:

Answer 2

• According to the question the length of the pendulum is L which is placed between the plates of a parallel plate capacitor having electric field E, as shown in figure.

There are two forces which act on the mass 'm'

These forces are i) Gravity force ii) Force by electric field

So net force on ‘m’ is √[(mg)^2 +(qE)^2]

T = 2π √L/√g

and g= √[(mg)^2 +(qE)^2] / m

so, T = 2π √[L/√{g^2 + (qE/m)^2}]

so the answer is option (A)