Charges `q` is uniformly distributed over a thin half ring of radius `R`. The electric field at the centre of the ring is

Charge q is uniformly distributed over a thin half ring of radius R . The electric field at the centre of the ring is

A charge +Q is uniformly distributed over a thin ring of the radius R. The velocity of an electron at the moment when it passes through the centre O of the ring, if the electron was initially at far away on the axis of the ring is (m=mass of electron, K=1/(4pi epsi_(0)) )

A charge +Q is uniformly distributed over a thin ring of the radius R. The velocity of an electron at the moment when it passes through the centre O of the ring, if the electron was initially at far away on the axis of the ring is (m=mass of electron, K=1/(4pi epsi_(0)) )

A charge Q is uniformly distributed only on the fourths portion of a ring of radius R . The elctric potential at centre of ring is

A positive charge Q is uniformly distribut along a circular ring of radius R. A small tc charge q is placed at the centre of the ring per figure, Then

A positive charge Q is uniformly distributed along a circular ring of radius R. A small test charge q is placed at the centre of the ring.