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
- A
$-\frac{Q}{2}$
- B
$-\frac{Q}{4}$
- C
$+\frac{Q}{4}$
- D
$+\frac{Q}{2}$
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