Electromagnetic Field Theory
A vector field A = p In is given in Cartesian coordinates. In cylindrical coordinates it will be represented as

 A = sinφ Ir.
 A = cosφ Ir + sinφ Iφ.
 A = cosφ Ir - sinφ Ir.
 A = cosφ Ir.

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Electromagnetic Field Theory
Two spheres of radius r1 and r2 are connected by a conducting wire. Each of the spheres has been given a charge Q. Now

 smaller sphere will have zero potential.
 larger sphere will have smalled potential.
 larger sphere will have greater potential.
 both of sphere will have same potential.

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