find out mass of the charge Q, so that it remains in equilibrium for the given configuration.

Explanation

To find the mass of the charge \( Q \) so that it remains in equilibrium in the given configuration, we can follow these steps:

### Step 1: Understand the Forces Acting on the Charge
In equilibrium, the electric force acting on the charge must balance the gravitational force (weight) acting on it. The weight \( W \) of the charge is given by:
\[ W = mg \]
where \( m \) is the mass of the charge and \( g \) is the acceleration due to gravity.
...