Electric Charges And Fields

Two identical metal spheres with charges and are separated by a distance. Force between them is F. They are connected by a conducting wire and then removed. Force between them now is

The insulation property of air breakdown is . Maximum charge in coulomb that can be given to a sphere of radius 10 cm is approximately

A conducting sphere of radius R carrying charge +Q is connected to an uncharged conducting sphere of radius 2R. The charge that flows between them is

Electric intensity due to an electric dipole varies with distance as where n is

The ratio of forces between two point charges in the two cases when their separation is halved and when it is doubled, is

A charge is to be divided into two parts, and , such that force between them is maximum. Then

A charge situated at a certain distance along the axis of an electric dipole experience a force . If the distance of the charge from the dipole is doubled, the force acting on it will become

Two point charges are apart and their combined charge is . The force of repulsion between them is . Charges are

Distance between two point charges is increased by 20%. Force of interaction between the charges

Charges and are kept separated by a certain distance and are placed at and , respectively. Electric intensity at is . Electric intensity at is

Two charges and are placed apart in air charge is placed at a point on the line joining so that the systein of these charges remains in equilibrium. Then, the distance of from and the value of are

Among the following, the correct graphical representation of electric intensity as a function of distance from the centre of a uniformly charged conducting sphere is shown in

An electron c penetrates through a thin plate A and enters the electric field region between parallel plates A and B. It gets slowed down Three other particles-proton (p), alpha particles and beta particles - similarly penetrate through either plate A or plate B as shown. The correct statement as regards the speed of the particles is

Two charged spheres of and are kept at a certain distance. They are touched and kept again at the same distance. What is the ratio of force experienced before and after?