If the charge on an object is doubled then electric field becomes

A spherical charged conductor has sigma as the surface density of charge. The electric field on its surface is E. If the radius of the sphere is doubled keeping the surface density of charge unchanged, what will be the electric field on the surface of the new sphere -

A charged particle is moving on circular path with velocityv in a uniform magnetic field B, if the velocity of the charged particle is doubled and strength of magnetic field is halved, then radius becomes

A charged particle is moving on circular path with velocityv in a uniform magnetic field B, if the velocity of the charged particle is doubled and strength of magnetic field is halved, then radius becomes

A point charge is brought in an electric field. The electric field at a near by point

A point charge is brought in an electric field. The electric field at a near by point

A point charge is brought in an electric field. The electric field at a near by point

Calculate distance of the point from the centre of a uniformly charged ring on its axis, where it electric field intensity becomes maximum.