A ring of radius R carries a charge +q. A test charge -q_0 is released on its axis at a distance ...

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A ring of radius R carries a charge +q. A test charge -q_0 is released on its axis at a distance √(3) R from its centre. How much kinetic energy will be acquired by the test charge when it reaches at the centre of the ring?
(a) 1/4 πε_0(q q_0/R)
(b) 1/4 πε_0(q q_0/2 R)
(c) 1/4 πε_0(q q_0/√(3) R)
(d) 1/4 πε_0(q q_0/3 R)

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