JEE Main · PhysicsHard
A thin ring of radius carries a charge distributed uniformly. A point charge is placed at the center of the ring. If the ring is slightly displaced along its axis, what is the frequency of oscillation?
- A.
- B.
- C.
- D.
Show correct answer & step-by-step solution
Correct answer: A —
Solution
- The electric field on the axis of a ring at distance is .
- For small , .
- The restoring force is .
- The angular frequency is , so .
- Hence the answer is (A).
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