Question

Consider a region inside which, there are various types of charges but the total charge is zero. At points outside the region ______. 

Options

• the electric field is necessarily zero.

• the electric field is due to the dipole moment of the charge distribution only.

• the dominant electric field is inversely proportional to r3, for large r (distance from the origin).

• the work done to move a charged particle along a closed path, away from the region will not be zero.

Answer 1

Consider a region inside which, there are various types of charges but the total charge is zero. At points outside the region the dominant electric field is inversely proportional to r3, for large r (distance from the origin).