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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