Two charges 4q and -q are placed a distance r apart. A charge Q is placed exactly midway between them. The value of Q so that charge -q experiences no net force is

two charge +q and -q are situated at a certain distance. At the point exactly midway between them

Two point charges +q and -q are placed a distance x apart. A third charge is so placed that al the three charges are in equilibrium. Then

Two free charges q and 4q are placed at a distance d apart A third charge Q is placed between them at a distance x from charge q such that the system is in equilibrium. Then magnitude of third charge and postion,

Two free charges q and 4q are placed at a distance d apart A third charge Q is placed between them at a distance x from charge q such that the system is in equilibrium. Then

Two point charges 2q and 8q are placed at a distance r apart. Where should a third charge -q be placed between them so that the electrical potential energy of the system is a minimum

Two charges of equal magnitude q are placed at a distance 2a Another charge q of mass m, is placed midway between the two charges on X-axis. If this charges is displaced from equilibruim state to a distance x(x lt lt a) , then the particle :-

Two point charges +4q and +q are placed at a distance L apart. A third charge Q is so placed that all the three charges are in equilibrium. Then location. And magnitude of the third charge will be

Two charges 4q and q are placed 30 cm. apart. At what point the value of electric field will be zero

Two charges +q and -q are placed at distance r. Match the following two columns when distance between them is changed to r'.