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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 equal charges Q. The system of the three charges will be in equilibrium if q is equal to:

A

`Q//2`

B

`-Q//4`

C

`+Q//4`

D

`-Q//2`

Text Solution

Verified by Experts


q has to be negative for equilibrium.
considering equilibrium of 1,
`F_(13)=F_(12)`
or `(KQxxQ)/((2l)^(2))=(kQq)/(l^(2))` or `q=(Q)/(4)`
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