Three charges `2q, -q, and -q` are located at the vertices of an equilateral triangle. At the center of the triangle,

Options

A. The field is zero but potential is non-zero
B. The field is non-zero but potential is zero
C. Both field and potential are zero
D. Both field and potential are non-zero

Answer

B

Explanation

If all charges are equal distance from the point and sum of charges = 0, then potential at that point is zero.
Trick:
V = 0 and `E ne 0`
because sum of charges = 0 and all charges are at equal distance.