Coulombs Law

Two equal negative charges each are fixed at points and on . A positive Charge is released from rest at the point on the . The charge will

Two identical metal spheres charged with and are kept at certain distance in air. They are brought into contact and then kept at the same distance. The ratio of the magnitudes of electrostatic forces between them before and after contact is

Two smalI spheres of masses and are suspended by weightless insulating threads of lengths and . The spheres carry charges and respectively. The spheres are suspended such that they are in level with one another and the threads are inclined to the vertical at angles of and as shown. Which one of the following conditions is essential, if ?