Numerical for class 12 on electric field and potential

A thin stationary ring of 1 m has a positive charge of 1 x 10-5C uniformly distributed over it. A particle of mass 0.9 gm and having a negative charge of 1 x 10-6 C is placed on the axis at a distance 1 cm from the center of the ring. Show that the motion of the negatively charged particle is approximately simple harmonic. Calculate the time period of oscillation.

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