The unit of electric field is

A charged particle of mass 8 gm remains stationary on a vertical electric field.10⁴KN/c.The amount of charge is

when a body is negatively charged by electrostatic conduction its mass will

Two charges exert a force F when kept at distance r between them is air.The distance at which they exert same force in a medium of relative permittivity 4 is

A simple pendulum having a bob of mass m carries a charge q when the bob is kept in a uniform electric field E is the horizontal direction the inclination of the string vertical is

Three charges +4q,Q and q are placed in a straight line of length l at points 0,l/2,l respectively what should be Q in order to make the net force on q to zero?

Two spherical conductors B and c of equal radii and carrying equal charge on them repel each other with a force F when kept apart at some distance.A third spherical conductor having some redius as that of B but uncharged is brought in contact with B and then with C and removed away from both.The new force of repulsion between B and C

Two charges q1 and q2 are seperated by a distance d in air.A dielectric slab of thickness t of relative permittivity k is introduced between them.The force between the two charges is nearly given by

Two particles of masses m and 2m with charges q and are placed in a uniform electric field E and allowed to move for the same time.The ratio of their kinetic energies will be

An electron moves along x direction with a uniform speed.An electric field is applied along the Z direction.The path of the electron will be