WAEC - Physics (2012 - No. 32)
When two like charges are brought together, the potential energy of the system formed will
increase because work is done against the field
increase because work is done by the field
decrease because work is done by the field
decrease because work is done against the field
Explication
if two like charges are close together, they repel each other. moving them closer together requires working against repulsive force which increases the potential energy of the system.