The magnitude of the electric field (E) at a certain location is calculated by dividing the force (F) by the charge (C). Mathematically,
E = F / C
E = (1.5 x 10^-9 N) / (4.55 x 10^-21 C)
E = 3.30 x 10^11 N/C
Therefore, the magnitude of the electric field is equal to 3.30 x 10^11 N/C.