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Two point charges+q nd -q are held fixed...

Two point charges+q nd -q are held fixed at `(-a,0)` and `(a,0)` respectively of a x-y coordinate system then

A

the electric field E at all point on the axis has the same direction.

B

E at all points on the y-axis is along `hati`

C

positive work is done in bringing a test charge from infinity to the origin

D

All of the above

Text Solution

Verified by Experts

The correct Answer is:
B

Potential is zero at infinite and at origin.
therefore `PD=0`. Hence the work done asked in part `c` is also zero.
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Knowledge Check

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

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  • In the figure, two point charges +q and -q are placed on the x-axis at (+a,0) and (-a,0) respectively. A tiny dipole of dipolem moment (p) is kept at the origin along the y-axis. The torque on the dipole equals

    A
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    B
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