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A thin non-conducting ring of radius has a total charge distributed uniformly along its circumference. A point charge is placed at the center of the ring. If the ring is slightly displaced along its axis by a distance where , the force on the charge is proportional to:
- 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 , the expression simplifies to .
- The force on charge is .
- Hence the answer is (A).
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