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Q.

A simple pendulum consists of a small sphere of mass m suspended by a thread of length L. The sphere carries positive charge q. The pendulum is placed in a uniform electric field E directed vertically upwards. If the electrostatic force is less than the gravitational force, the time period of oscillation is

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a

T=2πLg-Eqm

b

T=2πLg2+Eqm212

c

T=2πLg+Eqm

d

T=2πLg

answer is C.

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Detailed Solution

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Net force acing on the bob = Mg – Eq

g1=g-Eqm Time period =2πLg-Eqm

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