A charge Q is placed at each of the two ...

A charge Q is placed at each of the two opposite corners of a square, A charge q is placed at each of the two other opposite corners of the square. If the resultant electric force field on Q is zero, then how Q and q are related ?

A

`Q=(-q)/(2sqrt2)`

B

`Q=-2sqrt2q`

C

Q= -2Q

D

`Q=2sqrt2q`

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