Two positive point charges , each `Q` , are fixed at separation `d`. A third charge `q` is placed in the middle. Describe the equilibrium of the third charge.

Two free point charges +q and +4q are placed apart a distance x. A third charge is so placed that all the three charges are in equilibrium. Then

Two point charges q each are fixed at (a,0) and (-a,0). A third charge Q is placed at origin. Electrons potential energy of the system will

Two point charges q each are fixed at (a,0) and (-a,0). A third charge Q is placed at origin. Electrons potential energy of the system will

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

Two free point charges +q and +4q are placed apart a distance x . A third charge is so placed that all the three charges are in equilibrium. Then

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 force point charges +q and +4q are a distance l apart. A third charge q_(1) is so placed that the entire system is in equilibrium. Find the location, magnitude and sign of the third charge.

The charges q each are placed at a distance 2a and a third charge -2q is placed at the mid point. The P.E. of the system is

Two charges -q each are fixed separated by distance 2d. A third charge q of mass m placed at the midpoint is displaced slightly by x (x