Calculate the electric potential at the center of a square of side `sqrt(2) m`, having charges `100 muc, -50 muC, 20 muc and -60 muC` at the four corners of the square.

Explanation

To calculate the electric potential at the center of a square with charges at its corners, we will follow these steps:

### Step 1: Identify the charges and their positions
We have four charges located at the corners of a square:
- Charge at A: \( Q_1 = 100 \, \mu C = 100 \times 10^{-6} \, C \)
- Charge at B: \( Q_2 = -50 \, \mu C = -50 \times 10^{-6} \, C \)
- Charge at C: \( Q_3 = 20 \, \mu C = 20 \times 10^{-6} \, C \)
- Charge at D: \( Q_4 = -60 \, \mu C = -60 \times 10^{-6} \, C \)
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