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 "-".

1. Select the only true statement about the electric potential at points a, b and c.

The electric potential equals zero at points a and b, but not at point c.
The electric potential equals zero at points a and c, but not at point b.
The electric potential equals zero at none of these points.
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 point b, but not at points a and c.

2. What is the direction of the electric field at point b?
Up (to the top of the page).
The electric field is zero at this point.
Down (to the bottom of the page)
To the right.

(Please answer both questions)

Explanation / Answer

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

because point C is close to positive charges copmared to negative charges.

but point a and b are at equal distance to positive and negative charges.

2) To the right.

because, a postive charge produces electric field radially outward and

a negative charge produces electric field radially inward.

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