A circular ring lying in the x-y plane with its centre at the origin carries a uniformly distributed positive charge. The variation of the electric field `E` at the point `(0,0,z)` is correctly represented by the graph is

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

A circular ring carries a uniformly distributed positive charge .The electric field(E) and potential (V) varies with distance (r ) from the centre of thr ring along its axis as

Find the electric field at the centre of a semicircular ring if it is uniformly positive charged.

A point charge q is located at the centre fo a thin ring of radius R with uniformly distributed charge -q , find the magnitude of the electric field strength vectro at the point lying on the axis of the ring at a distance x from its centre, if x gt gt R .

A ring of radius R is placed in the plane with its centre at origin and its axis along the x-axis and having uniformly distributed positive charge.A ring of radius r( ltlt R) and coaxial with the larger ring is moving along the axis with constant velocity then the variation of electrical flux (phi) passing through the smaller ring with position will be best represented by :

A uniformly charged square plate having side L carries a uniform surface charge density sigma . The plate lies in the y - z plane with its centre at the origin. A point charge q lies on the x-axis. The flux of the electric field of q through the plate is phi0 , while the foce on the point charge q due to the plate is F_(0) , along the x-axis. Then,

A positively charged thin metal ring of radius R is fixed in the xy plane with its centre at the origin O. A negatively charged particle P is released from rest at the point (0, 0, z_0) where z_0gt0 . Then the motion of P is