The minimum velocity v with which charge q should be projected so that it manages to reach the centre of the ring starting from the position shown in figure is

A unit positive point charge of mass m is projected with a velocity v inside the tummel as shown. The tunnel has been made inside a uniformly charged non conducting sphere. The minimum velocity with which the point charge should be projected such that it can it reach the opposite end of the tunnel, is equal to:

A unit positive point charge of mass m is projected with a velocity v inside the tummel as shown. The tunnel has been made inside a uniformly charged non conducting sphere. The minimum velocity with which the point charge should be projected such that it can it reach the opposite end of the tunnel, is equal to:

A unit positive point charge of mass m is projected with a velocity V inside the tunnel as shown. The tunnel has been made inside a uniformly charged nonconducting sphere. The minimum velocity with which the point charge should be projected such that it can reach the opposite end of the tunnel is equal to

The adjoining figure represent a semi-circular loop of charge Q and of radius R .The minimum velocity with which a point mass m of charge -q should be projected so that it becoems free from the influence of the loop is

Two concentric rings placed in a gravity free region in yz-plane one of radius R carries a + Q and second of radius 4R and charge –8Q distributed uniformly over it. Find the velocity with which a point charge of mass m and charge +q should be projected from a a distance 3R from the centre of rings on its axis so that it will reach to the centre of the rings.

Two identical coaxial rings each of radius R are separated by a distance of sqrt3R . They are uniformly charged with charges +Q and -Q respectively. The minimum kinetic energy with which a charged particle (charge +q ) should be projected from the centre of the negatively charged ring along the axis of the rings such that it reaches the centre of the positively charged ring is

Two identical coaxial rings each of radius R are separated by a distance of sqrt3R . They are uniformly charged with charges +Q and -Q respectively. The minimum kinetic energy with which a charged particle (charge +q ) should be projected from the centre of the negatively charged ring along the axis of the rings such that it reaches the centre of the positively charged ring is