NCERT Physics Class 12 Exemplar Chapter 1 Electric Charges and Fields Part 5

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Q. 13 A positive charge is uniformly distributed along a circular ring of radius . A small test charge is placed at the center of the ring (Fig.). Then

Tittle: Image of The Circular Ring of Radius R

Uniform Charge on Ring

Tittle: Image of The Circular Ring of Radius R

  1. If and is displaced away from the centre in the plane of the ring, it will be pushed back towards the centre.

  2. If and is displaced away from the centre in the plane of the ring, it will never return to the centre and will continue moving till it hits the ring.

  3. If , it will perform SHM for small displacement along the axis.

  4. at the centre of the ring is in an unstable equilibrium within the plane of the ring for .

Answer: (A), (B), (C), and (D)