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

Options

A. the electric field is necessarily zero.
B. the electric field is due to the dipole moment of the charge distribution only.
C. the dominant electric field is `prop 1/r^3`, for large r, where r is the distance from a origin in this region.
D. the work done to move a charged particle along a closed path, away from the region, will be zero.

Answer

C, D

Explanation

Net charge of the system is zero, hence, there will be a net electric dipole moment of the system and for point at a large distance from electric dipole, the eloctric field intensity is inversely proportional to the cube of the distance from the centre of dipole. For conservative force field work done in a closed path is zero.