If the magnitude of the electric force experienced by a -5.2 μC charge at point P is 18.8 N, what is the strength of the electric field at that point?
a) 3.62 × 10^-6 N/C
b) 3.62 × 10^6 N/C
c) 3.62 × 10^7 N/C
d) 3.62 × 10^-7 N/C