A positive charge Q is uniformly distributed along the length L of a rod. It is bent in the shape of a square. Calculate electric field intensity at the centre of the square.

Explanation

To calculate the electric field intensity at the center of a square formed by bending a uniformly charged rod, we can follow these steps:

### Step 1: Understand the Charge Distribution
The total positive charge \( Q \) is uniformly distributed along the length \( L \) of the rod. When the rod is bent into a square shape, each side of the square will have a charge of \( \frac{Q}{4} \).

### Step 2: Identify the Geometry
The square has four equal sides. Let’s denote the length of each side of the square as \( a \). Since the total length \( L \) of the rod is equal to the perimeter of the square, we have:
\[
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