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Q.

A ring of radius R carries a charge +q. A test charge -q0 is released on its axis at a distance 4R from its centre. How much kinetic energy will be acquired by the test charge when it recaches  at the centre of the ring?

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a

14πε0qq0R

b

14π0qq02R

c

14πε0qq03R

d

14πε0qq03R

answer is B.

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Detailed Solution

Ki+Ui=Kf+Uf 0-q0Vi=Kf-q0Vf

Question Image

Kf=q0Vf-Vi =q0q4πε01R-12R =14πε0qq02R

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A ring of radius R carries a charge +q. A test charge -q0 is released on its axis at a distance 4R from its centre. How much kinetic energy will be acquired by the test charge when it recaches  at the centre of the ring?