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**1. Homework Statement**

three point charges, each of 10^-9 are located at 3 corners of a square of side 20cm. Calculate the electric potential at the forth corner.

**2. Homework Equations**

V = Q / (4(pi)(epsilon 0) r)

**3. The Attempt at a Solution**

Potential because of corner A = 10^-9 / (4 (pi) (epsilon 0) 0.2)

= 44.96

Potential because of corner B = 10^-9 / (4 (pi) (epsilon 0) 0.2)

= 44.96

Potential because of corner C = 10^-9 / (4 (pi) (epsilon 0) 0.284)

= 31.66

A + B + C = 121.58

Is this correct, finding the potential from each point charge individualy?

Also there is another question very similar to this where there are 4 point charges on the corners of a square, and we need to find the potential at the centre, would i do this the same as above, (providing what i did above is correct.