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A charge Q is placed at the centre of th...

A charge Q is placed at the centre of the line joining two point charges +q and +q as shown in figure. The ratio of charges Q and q is

A

4

B

`1//4`

C

-4

D

`-1//4`

Text Solution

Verified by Experts

The correct Answer is:
D
For the system to be in equilibrium,
net force on q = 0 or `(Qq)/(4piepsilon_(0)x^(2))+(qq)/(4piepsilon_(0)(2x)^(2))=0`
or `Q=(-q)/4orQ/q=-1/4`
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