Electrostatics 1 Question 21
22. A ring of radius $R$ carries a uniformly distributed charge $+Q$. A point charge $-q$ is placed on the axis of the ring at a distance $2 R$ from the centre of the ring and released from rest. The particle executes a simple harmonic motion along the axis of the ring.
(1988, 2M)
Analytical & Descriptive Questions
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Answer:
Correct Answer: 22. $-q E a$
Solution:
- Motion is simple harmonic only when charge $-q$ is not very far from the centre of ring on its axis. Otherwise motion is periodic but not simple harmonic in nature.
