Electrostatics Question 456

Question: A simple pendulum of period $ T $ has a metal bob which is negatively charged. If it is allowed to oscillate above a positively charged metal plate, its period will [AIEEE 2002; CBSE PMT 2001]

Options:

A) Remains equal to T

B) Less than $ T $

C) Greater than $ T $

D) Infinite

Show Answer

Answer:

Correct Answer: B

Solution:

When a negatively charged pendulum oscillates over a positively charged plate then effective value of g increases so according to $ T=2\pi \sqrt{\frac{l}{g}}, $ T decreases.



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