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Q.

A fixed uniformly charged ring of radius 3 m has a positive linear charge density -50 μC/m. A point charge 5 μC is moving towards the ring along its axis such that its kinetic energy at A is 5 J. Its kinetic energy at the centre of ring will be nearly :

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a

1.3 J

b

2.7 J

c

3.1 J

d

4.1 J

answer is A.

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Detailed Solution

From COME, KA+UA=Ko+Uo⇒Ko=KA+UA-Uo=KA+qkλ(2πR)R2+d2-kλ(2πR)R                                       =1.3 J
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