An Electron Moves with a Speed Of $3.0 \times 104 \mathrm {~m} / \mathrm { s }$

An electron moves with a speed of $3.0 \times 104 \mathrm {~m} / \mathrm { s }$ perpendicular to a uniform magnetic field of $0.40$ T. What is the magnitude of the magnetic force on the electron? $\left( e = 1.60 \times 10 ^ { - 19 } \mathrm { C } \right)$

A) $4.8 \times 10 ^ { - 14 } \mathrm {~N}$
B) $0 \mathrm {~N}$
C) $2.2 \times 10 - 24 \mathrm {~N}$
D) $5 \times 10 - 20 \mathrm {~N}$
E) $1.9 \times 10 - 15 \mathrm {~N}$