Four equal point charges Q each are placed in the xy plane at (0,2), (4,2), (4,-2) and (0, -2)`. The work required to put a fifth charge Q at the origin of the coordinate system will be

Two point charges of +Q each have been placed at the positions (–a//2, 0, 0) and (a//2, 0, 0) . The locus of the points in YZ plane where –Q charge can be placed such the that total electrostatic potential energy of the system can become equal to zero, is represented by which of the following equations ?

Two equal negative charges each of -q are fixed at the points (0,a) and (0,-a) on the y - axis . A positive charge Q is released from rest at the point (2a,0) on the x-axis. Will the charge Q execute SHM about the origin ?

Four equal charges Q are placed at the four corners of a square of each side is 'a'. Work done in removing a charge -Q from its centre to infinity is

Four equal charges Q are placed at the four corners of a square of each side is 'a'. Work done in removing a charge -Q from its centre to infinity is

Two point charges of +Q each have been placed at the positions (-a //2,0, 0) and (a // 2, 0,0) .The locus of the points where - Q charge can be placed such the that total electrostatic potential energy of the system can become equal to zero, is represented by which of the following equations ?

Four charges +q,+q-q, and -q are placed on X - Y plane at the points whose coordinates are (0.5, 0), (0, 0.5), (-0.5, 0) and (0, -0.5) respectively. The electric field due to these charges at a point P(r,r), where r gtgt 0. 5 , will be

Four charges +q,+q-q, and -q are placed on X - Y plane at the points whose coordinates are (0.5, 0), (0, 0.5), (-0.5, 0) and (0, -0.5) respectively. The electric field due to these charges at a point P(r,r), where r gtgt 0. 5 , will be