Four point charges of equal magnitude are arranged at the corners of a square as

Question

Four point charges of equal magnitude are arranged at the corners of a square as shown in the figure. Positive charges are indicated by "+" and negative charges are indicated by "-".

picture won't upload: http://www.flickr.com/photos/67913919@N05/

Select the only true statement about the electric potential at points a, b and c.
The electric potential equals zero at none of these points.
The electric potential equals zero at point b, but not at points a and c.
The electric potential equals zero at points a and b, but not at point c.
The electric potential equals zero at point c, but not at points a and b.
The electric potential equals zero at points a, b and c.
The electric potential equals zero at points a, but not at points b and c.
The electric potential equals zero at points b and c, but not at point a.
The electric potential equals zero at points a and c, but not at point b.

Explanation / Answer

The electric potential equals zero at points a and b, but not at point c.

To the left.

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