Two identical `+ve` charges are at the ends of a straight line `AB` .Another identical `+Ve` charge is placed at`C` such that `AB=BC` ,A,B, and C being oh the same line. Now the force on `A`

Two equal and similar charges are placed along a straight line. A third equal and similar charge is placed midway between the two charges. Then, the system, will:

There are two charged identical metal spheres A and B repel each other with a force 3xx10^(-5)N . Another identical uncharged sphere C is touched with A and then placed at the mid-point between A and B. Net force on C is

Two equally charged metal spheres A and B repel each other with a force of 4xx 10^(-5)N . Another identical uncharged sphere C is touched to A and then placed at the mid-point of the line joining the sphere A and B. The net electric force on the sphere C is

Charges 2q and 8q are placed at the end points A and B repsectively of a 9 cm long straight line. A third charge q is placed at a point C of AB such that the potential energy of the system is minimum . The distance of C from A is

Two unit negative charges placed on a straight line. A positive charge q is placed exactly at the mid point between these unit charges. If the system of these three charges is in equilibrium, the value of q (in C) is

There charges q, 3q and 12q are to be placed on a straight line AB having 12 cm length. Two of the charges must be placed at end points A and B and the third charge can be placed anywhere between A and B. Find the position of each charge if the potential energy of the system is to be minimum. In the position of minimum potential energy what is the force on the smallest charge?

Two particle of masses m and 2m are at a distance 3r apart at the ends of a straight line AB . C is the centre of mass of the system. The magnitude of the gravitational force on a unit mass placed at C due to the masses is