A thin fixed ring of radius a has a positive chage q unformly distributed over it.A particle of mass m having a megative charge Q, is placed on the axis at a distance of `x(xltlta)` form the center of the ring. Show that the motion of the negatively chaged particle is approximatly simple harmonic. Calculate the time period of oscillation.

A thin fixed of radius 1 metre has a positive charge 1xx10^-5 coulomb uniformly distributed over it. A particle of mass 0.9 gm and having a negative charge of 1xx10^-6 coulomb is placed on the axis at a distance of 1cm from the centre of the ring. Show that the motion of the negatively charged particle is approaximately simple harmonic. Calculate the time period of oscillations.

A thin semi-circular ring of radius r has a positive charge q distributed uniformly over it. The net field vecE at the centre O is

A thin semi-circular ring of radius r has a positive charge q distributed uniformly over it. The net field vecE at the centre O is

A thin semi-circular ring of radius r has a positive charge q distributed uniformly over it. The net field vecE at the centre O is