A positive charge Qis uniformly distributed along a circular ring of radius R. A small test charge q is placed at the centre of the ring as shown in figure. Then

(a) If q>0 and is displaced away from the centre in the plane of the ring it will be pushed back towards the centre

(b) If q<0 and is displaced away from the centre in the plane of the ring, it will never return to the centre an will continue moving till it hits the ring

(c) If q<0 , it will perform SHM for small displacement along the axis.

(d) Q at the centre of the ring is in an unstable equilibrium within the plalne of the ring for q>O

0 12 Views | Posted 4 months ago
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  • A

    Answered by

    alok kumar singh | Contributor-Level 10

    4 months ago

    This is a Multiple Choice Questions as classified in NCERT Exemplar

    Answer- a, b, c

    Explanation- the positive charge Q is uniformly distributed at the outer surface of the enclosed sphere thus electric field inside the sphere is zero. So the effect of electric field on charge q due to positive charge Q is zero.

    Now the only attractive and repulsive force between Q and q

    Case 1 q>0  this creates repulsive force

    Case 2 q<0 this creates attractive force

     If q is shifted from the centre then the positive charges nearer to this charge will attract it towards itself and charge q will never return to its centre.

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