Establish relation between electric field and potential gradient.
Or
Derive relationship between Electric field intensity and potential gradient at a point in the electric field.

Explanation

To establish the relationship between electric field intensity (E) and potential gradient (dV/dr), we can follow these steps:

### Step 1: Understanding Electric Field and Electric Potential
- **Electric Field (E)**: It is defined as the force per unit charge experienced by a positive test charge placed in the field. Mathematically, it can be expressed as:
\[ E = \frac{F}{q} \]
where \(F\) is the force experienced by the charge \(q\).
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