A CHARGE (-q) and another charge (+Q) are kept at two points A and B respectively.Keeping the charge (+Q) fixed at B,the charge (-q) at Ais moved to another point C such that ABCforms an equilateral triangle of side l.The net work done in moving the charge (-q) is ____________
A cube of metal is given a positive charge Q.For the above system,which of the followingstatement is true ?
1)electric potential at the surface of the cube is zero 2)electric potential within the cube is zero
3)electric field is normal to the surface of the cube4)electric field varies within the cube