A fixed uniformly charged ring of radius $$3$$ m has a positive linear charge density $$-50$$ μ$$C/m$$. 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 :

Question

Infinity Learn · Accepted Answer

From COME, $$KA+UA=Ko+Uo$$⇒$$Ko=KA+UA-Uo=KA+qk$$λ$$(2$$$$π$$$$R)R2+d2-k$$λ$$(2$$$$π$$$$R)R$$                                       $$=1.3$$ J

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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