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Two point charges q AND 2q are placed at...

Two point charges q AND 2q are placed at (a,0) and (0,a) A point charge `q^(1)` is placed at a P on the quarter circle of radius a as shown in the diagram so that the electric field at the origin becomes zero

A

the point P is `((a)/(sqrt(3)),(sqrt(2)a)/(sqrt(3)))`

B

the point P is `((a)/(sqrt(5)),(sqrt(2)a)/(sqrt(5)))`

C

`q_(1) = - 5q`

D

none of these

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The correct Answer is:
B
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