Q.

A thin copper ring of radius ‘a’ is charged with q units of electricity. An electron is placed at the centre of the copper ring. If the electron is displaced a little, it will have frequency.

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a

12πeq4πε0ma3

b

12πq4πε0 ema3

c

eq4πε0ma

d

q4πε0 ema3

answer is A.

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Detailed Solution

Eaxial=14πE0qxa3x<
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A thin copper ring of radius ‘a’ is charged with q units of electricity. An electron is placed at the centre of the copper ring. If the electron is displaced a little, it will have frequency.