Derive an expression for electric field intensity at a point due to point charge.

Explanation

To derive the expression for electric field intensity (E) at a point due to a point charge (Q), we can follow these steps:

### Step 1: Understanding the Concept of Electric Field
The electric field (E) at a point in space is defined as the force (F) experienced by a unit positive charge (Q₀) placed at that point.

### Step 2: Coulomb's Law
According to Coulomb's Law, the force (F) between two point charges (Q and Q₀) separated by a distance (r) is given by:
\[
...