If a charge $q$ is placed at the centre of the line joining two equal charges $Q$ such that the system is in…

If a charge $q$ is placed at the centre of the line joining two equal charges $Q$ such that the system is in equilibrium then the value of $q$ is
  1. $Q / 2$
  2. $-Q / 2$
  3. $\mathrm{Q} / 4$
  4. $-Q / 4$

Solution

Apply the condition for equilibrium of each charge

Asked in: JEE Main 2002

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