Electrostatics ...

A charge Q coulomb is placed on a solid piece of metal of irregular shape. The charge will distribute itself

Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4) and (4,1) show electrostatic attraction, while pair (2, 3) and (4, 5) show repulsion.Therefore ball 1 must be

Equal charges q are placed at the four corners A, B, C ,D of a square of length a. The magnitude of the force onthe charge at B will be

Two identical conductors of copper and aluminum are placed in an identical electric fields. The magnitude of induced charge in the aluminum will be

The ratio of electrostatic and gravitational forces acting between electron and proton separated by a distance 5 × 10^–11m, will be (Charge on electron = 1.6 × 10^–19 C, mass of electron = 9.1 × 10^–31 kg, mass of proton = 1.6 × 10^–27 kg, G = 6.7 × 10^–11 Nm² / kg²

Two identical spheres carrying charges –9µC and 5µC respectively are kept in contact and then separated from each other. Point out true statement from the following. In each sphere

Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is

Four metal conductors having different shapes
1. A sphere
2. Cylindrical
3. Pear
4. Lightning conductor
are mounted on insulating stands and charged. The one which is best suited to retain the charges for a longer time is

Two positive ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the ions, the number of electrons missing from each ion will be (e being the charge on an electron)

A ball with charge –50 e is placed at the centre of a hollow spherical shell which has a net charge of –50 e. What is the charge on the shell\'s outer surface