Two identical charges $Q$ are separated by a distance $r$. $A$ third charge $q$ is placed at the midpoint of the line joining the two charges such that all three charges are in equilibrium. In this state,$q = $ . . . . . . .
- A$ - \frac{Q}{2} $
- B$ - \frac{Q}{4} $
- C$ + \frac{Q}{4} $
- D$ + \frac{Q}{2} $
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