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Consider a region inside which, there ar...

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

A

the electric field is necessarily zero.

B

The electric field is due to the dipole moment of the cahrge 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 regions.

D

the work done to move a charged particle along a closed path, away from the region, will be zero.

Text Solution

Verified by Experts

The correct Answer is:
C, D
When there are various types of charges in a region, but the total charge is zero, the region can be supposed to contain a number of electric dipoles. Therefore, at points outside the region (may be anywhere w.r.t. electric dipoles) the dominant electric field `prop(1)/(r_(3))` for large r.
Further, as electric field is conservative, work done to move a charged particle along a closed path, away from the region will be zero.
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