Electric Charges And Fields

A charge is located at the centre of a cube. The electric flux through any face is

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force F between the two is

A table tennis ball which has been covered with a conducting paint is suspended by a silk thread so that it hangs between two metal plates. One plate is earthed. When the other plate is connected to a high voltage generator, the ball

Figure below show regular haxagons, with charges at the vertices. In which case is the electric field at the centre zero ?

A charge is uniformly distributed over a large square plate of copper. The electric field at a point very close to the centre of the plate is 10 . If the copper plate is replaced by a plastic plate of the same geometrical dimensions and carrying the same charge uniformly distributed, then the electric field at the point will be

A charged particle is free to move in an electric field. It will travel

An electron moving with the speed per sec is shooted parallel to the electric field of intensity . Field is responsible for the retardation of motion of electron. Now evaluate the distance travelled by the electron before coming to rest for an instant (mass of , charge