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Two positive point charges of magnitude Q each are separated by a distance "2a". A test charge `'g_0'` is located in a plane which is normal to the line joining these charges and midway between them. The locus of the points in this plane for which the force on the test charge has a maximum value is

A

a circle of radius `r=a//sqrt2`

B

a circle of radius r=a

C

a straight line

D

an ellipse

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The correct Answer is:
A
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