Two small balls, each carrying a charge q are suspended by equal insulated strings of length / m from the hook of a stand. This arrangement is carried in a satellite in space. The tension in each string will be

In the satellite the two balls will be in a straight line. Let T be tension in each string. Force acting on the ball F=14πε0×q2(2l)2                  ...(1)This force is balanced by the tension of string. Hence                     T=F                     ...(2)From eqs. (1) and (2),T=14πε0×q24l2