Question

Sketch of feild lines associated with two separated point charges +q and -2q

Answer 1

Explanation:

At any point the direction of electric field due to charge Q is away from Q and due to −4Q will be towards the −4Q. So the required point should not be between two charges.

As ∣Q∣<∣−4Q∣ the point of zero electric field should be nearer to Q, to cancel the electric field due to −4Q. Out of the given options, A fits the above criteria.