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Two point charges +q and -q are held fix...

Two point charges `+q` and `-q` are held fixed at `(-d,o)` and `(d,0)` respectively of a x-y coordinate system. Then

A

electric field E at all points on the x-axis has the same direction.

B

electric field at all points on the y-axis is along the x-axis

C

work has to be done in bringing a test charge from `oo` to the origin.

D

the dipole moment is 2qd along the x-axis.

Text Solution

Verified by Experts

b. If we take a point `M` on the x-axisas shown in Fig. SAI.127, then the net electric field in in the x-direction.Therefore, option (a) is incorrect. If we take a point `N` on y-axis, we find net electric field along `+x`-direction. The same will be true for any point on Y-axix.
Option (c) is incorrect, The direction of dipole moment is from negative to positive Therefore, (d) is incorrect.
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