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 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
- [AIEEE 2002]
- [IIT 1987]
- [AIPMT 1995]
- [AIIMS 2017]
- A
$ - \frac{Q}{2}$
- B
$ - \frac{Q}{4}$
- C
$ + \frac{Q}{4}$
- D
$ + \frac{Q}{2}$
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