A Proton Travels at a Speed Of $5.0 \times 10 ^ { 7 } \mathrm {~m} / \mathrm { s }$

Multiple Choice

A proton travels at a speed of $5.0 \times 10 ^ { 7 } \mathrm {~m} / \mathrm { s }$ through a $1.0 - \mathrm { T }$ magnetic field. What is the magnitude of the magnetic force on the proton if the angle between the proton's velocity and the magnetic field vector is $30 ^ { \circ } ? \left( e = 1.60 \times 10 ^ { - 19 } \mathrm { C } \right)$

A) $2.0 \times 10 ^ { - 12 } \mathrm {~N}$
B) $2.0 \times 10 ^ { - 14 } \mathrm {~N}$
C) $4.0 \times 10 ^ { - 14 } \mathrm {~N}$
D) $4.0 \times 10 ^ { - 12 } \mathrm {~N}$