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Two point charges +4q and +q are placed ...

Two point charges `+4q` and `+q` are placed at a distance L apart. A third charge Q is so placed that all the three charges are in equilibrium. Then location and magnitude of third charge will be

A

unknown charge is `-4q//9`

B

unknown charge is `-9q//4`

C

it should be at `(x//3)` from smaller charge between them

D

it should be placed at `(2x//3)` from smaller charge between them.

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The correct Answer is:
A, C
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