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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

(a) `Q/2`

B

(b) `-Q/2`

C

(c) `Q/4`

D

(d) `-Q/4`

Text Solution

Verified by Experts

The correct Answer is:
D
For equilibrium of charge Q
`K(QxxQ)/((2x)^2)+K(Qq)/(x^2)=0impliesq=-Q/4`
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