A Proton Moving Eastward with a Velocity Of $5.0 \mathrm {~km} / \mathrm { s }$

Multiple Choice

A proton moving eastward with a velocity of $5.0 \mathrm {~km} / \mathrm { s }$ enters a magnetic field of $0.20 \mathrm {~T}$ pointing northward. What are the magnitude and direction of the force that the magnetic field exerts on the proton? $\left( e = 1.60 \times 10 ^ { - 19 } \mathrm { C } \right)$

A) $1.6 \times 10 ^ { - 16 } \mathrm {~N}$ upwards
B) $4.4 \times 10 ^ { - 16 } \mathrm {~N}$ westwards
C) $0 \mathrm {~N}$
D) $1.6 \times 10 ^ { - 16 } \mathrm {~N}$ downwards
E) $1.1 \times 10 ^ { - 16 } \mathrm {~N}$ eastwards