A point charge + q is placed at midpoint of a cube of side L. The electric flux emerging from the cube is

The study of the effects associated with electric charges at rest is called 

Two equally charged small balls A and B, placed at a fixed distance experience a force F. A similar uncharged ball C after touching one of them is placed at a middle point between the two balls. The force experienced by ball A, is

Two spherical conductors A and B of radii 1mm and 2mm are separated by a distance of 5 cm and are uniformly charged. If the spheres are connected by a conducting wire then the equilibrium condition, the ratio of the magnitude of the electric fields at the surfaces of spheres A and B is

A particle of mass m and charge q is placed at rest in a uniform electric field E and then released. The Kinetic energy attained by the particle after moving a distance y is

A large solid sphere with uniformly distributed positive charge has a smooth narrow tunnel through its centre. A small particle with negative charge, initially at rest far from the sphere, approaches it along the line of tunnel, reaches its surface with a speed v, and passes through the tunnel. Its speed at the centre of the sphere will be

The electric potential V at any point (x₁, y₁, z₁) in space is given by V = 4x² volt. The electric field at (1, 0, 2) m in Vm^-1 is

There is an electric field E in x - direction. If the work done on moving a charge of 0.2 C through a distance of 2 m along a line making an angle 60^o with x-axis is 4 J, then what is the value of E?