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Question: Answered & Verified by Expert
Consider a region inside which there are various types of charges but the total charge is zero. At points outside the region,
PhysicsElectrostatics
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 $\propto \frac{1}{\mathrm{r}_3}$, for large $\mathrm{r}$, where $\mathrm{r}$ is the distance from a origin in the regions
  • D
    the work done to move a charged particle along a closed path, away from the region, will be zero
Solution:
1281 Upvotes Verified Answer
The correct answers are:
the dominant electric field is $\propto \frac{1}{\mathrm{r}_3}$, for large $\mathrm{r}$, where $\mathrm{r}$ is the distance from a origin in the regions
,
the work done to move a charged particle along a closed path, away from the region, will be zero
The electric field due to dipole is proportional to $\left(1 / r^3\right)$. When there are various types of charges in a region, but the net charge is zero, the region is, supposed to contain a number of electric dipoles.
So, at points outside the region the dominant electric field
$\propto \frac{1}{r^3}$ for large $r$.
Then, 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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