Q.11. Two charges q and 4q are placed at (a, 0) and (- 2a, 0). Neutral point is at
(1) a 2 ,   0
(2) a ,   0
(3) a 3 ,   0
(4) (0, 0)

Dear student, 

The neutral point is the point where the net electric field is zero. 

distance between points=(-2a-a)2+(0-0)2=3a

using this information now you can refer to the link below for the answer to a similar query,
https://www.meritnation.com/ask-answer/question/two-point-charges-q-and-4q-are-seperated-by-a-distance/electric-charges-and-fields/1689893 

Regards

 

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The correct answer must be 4 option I am sending attachment for my solution regards .Anoman

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