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Statement of a problem № 3650

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A thin fixed ring of radius 1 m has a positive charge 1x10^5 C uniformly distributed over it. A particle of mass 0.9 g and having negative charge of 1x10^(-6) C is placed on the axis, at a distance of 1 cm from the centre of the ring. Show that the motion of the negative charge is approximately simple harmonic. Calculate the time period of oscillation.

Solution:
A thin fixed ring of radius 1 m has a positive charge 1x10^5 C uniformly distrib

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