An Electron Moves with a Speed Of $5.0 \times 104 \mathrm {~m} / \mathrm { s }$

An electron moves with a speed of $5.0 \times 104 \mathrm {~m} / \mathrm { s }$ perpendicular to a uniform magnetic field of magnitude $0.20 \mathrm {~T}$ . What is the magnitude of the magnetic force on the electron? $\left( e = 1.60 \times 10 ^ { - 19 } \right.$ C)

A) $5 \times 10 - 20 \mathrm {~N}$
B) $2.6 \times 10 - 24 \mathrm {~N}$
C) zero
D) $4.4 \times 10 - 14 \mathrm {~N}$
E) $1.6 \times 10 - 15 \mathrm {~N}$