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.
