Electrostatics ...

Two equal negative charges –q are fixed at points (o, a) and (o, –a). A positive charge Q is released from rest at the point (2a, o) on the X - axis. The charge Q will ..........

Four charges, each equal to –Q, are placed at the corners of a square and a charge +q is placed at its centre. If the system is in equilibrium, the value of q is .........

For the system shown in figure, if the resultant force on q is zero, then Q = ...............

Two point positive charges q each are placed at (–a, o) and (a, o). A third positive charge q_o is placed at (o, y). For which value of y the force at q_o is maximum .........

Two identical charged spheres suspended from a common point by two massless strings of Length l are initially a distance d (d << l ) apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result the spheres approach each other with a velocity ν. Then function of distance x between them becomes ...........

Three identical spheres each having a charge q and radius R, are kept in such a way that each touches the other two spheres. The magnitude of the electric force on any sphere due to other two is ...........

Two equal negative charges –q are fixed at points (o, a) and (o, –a) on the Y axis. A positive charge q is released from rest at the point x (x < < a) on the X-axis, then the frequency of motion is .........

Two identical balls having like charges and placed at a certain distance apart repel each other with a certain force. They are brought in contact and then moved apart to a distance equal to half their initial separation. The force of repulsion between them increases 4.5 times in comparison with the initial value. The ratio of the initial charges of the balls is........

A point charge q is situated at a distance r from one end of a thin conducting rod of length L having a charge Q (uniformly distributed along its length). The magnitude of electric force between the two, is ...............