A simple pendulum has a bob of mass m and charge q. A uniform horizontal electric field E is applied. Find the final tension in the string when equilibrium is attained.

Question

Shiksha Nation · Accepted Answer

Forces acting on bob:

Weight = mg downward
Electric force = qE horizontal

At equilibrium, tension balances both forces:
T = &radic;[(mg)&sup2; + (qE)&sup2;]
Answer:
T = &radic;[(mg)&sup2; + (qE)&sup2;]

A simple pendulum has a bob of mass m and charge q. A uniform horizontal electric field E is applied. Find the final tension in the string when equilibrium is attained.

Verified Answer