Two point charges of +3μC and −3μC are separated by 6cm on a horizontal line. Point P is located exactly midway between them. Which statement best describes the electric potential and electric field at point P?
a) Both the electric potential and the electric field are zero at P.
b) The electric potential is non-zero, and the electric field is zero at P.
c) The electric potential is zero, and the electric field has non-zero magnitude at P.
d) Both the electric potential and the electric field have non-zero magnitudes at P.