Three charges, each equal to q, are placed at the three. corners of a square of side a . Find the electric field at. the fourth corner.

Explanation

To find the electric field at the fourth corner of a square due to three charges placed at the other three corners, we can follow these steps:

### Step 1: Understand the Configuration
We have a square with side length \( a \). Let's label the corners of the square as follows:
- Corner A (0, 0) has charge \( q \)
- Corner B (a, 0) has charge \( q \)
- Corner C (a, a) has charge \( q \)
- Corner D (0, a) is the corner where we want to find the electric field.
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