A positive charge Q is fixed at a point in space. There is another charge -q, which moves in a circular path of radius r around the given fixed charge . Assume that the electrostatic force between them is the only force acting on them. Calculate time period of revolution of charge .

Explanation

To find the time period of revolution of the charge -q around the fixed charge Q, we can follow these steps:

### Step 1: Identify the Forces Acting on the Charge
The only force acting on the charge -q is the electrostatic force due to the charge Q. This force can be described by Coulomb's Law:
\[ F = \frac{k \cdot |Q \cdot (-q)|}{r^2} \]
where \(k\) is Coulomb's constant, \(Q\) is the positive charge, \(q\) is the negative charge, and \(r\) is the distance between the charges.
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