Two charges q and -3q are placed fixed on X-axis separated by distance 'd'. Where should a thrd charge 2q be placed such that it will not experience any force?

Two fixed point charge 4Q and 2Q are separated by a distance x. where should a third point charge q be placed for ti to be in equilibrium?

Two free point charges each of +4q and +q are placed at a distance a apart. Where should a third point charge Q be placed between them so that the entire system is in equilibrium?

Two point charge +q and -q are separated by a distance d. Where besides at infinity is the electric potential zero?

Three point charges q, 2q and 8q are to be placed on a . 9cm long straight line. Find the . positions where the charges shouldbe placed such that the potential energy . of this sysrem is minimum. In this situation, what is the . electric field at the charge q due to the other two charges?

Two charges -q each are separated by distance 2d. A third charge +q is kept at mid-point O. Find the potential energy of +q as a function of small distance x from O due to -q charges. Sketch P.E. v/s x and convince yourself that the charge at O is an unstable equilibrium?

Two equal charges placed in air separated by a distance 3 m repel each other with force 0.1 g f. Calculate the magnitude of either of the charges.

Two equal charges placed in air and separated by a distance of 2 m repel each other with a force of 10^-4 N. Calculate the magnitude of either of the charges.

A charge is situated outside an unchanged hollow conductor experience a force if another charge B is placed inside the conductor, but B does not experience any force. Why? Does it not violate the third law of motion?