Chapter 2.4, Problem 239E

$\left[\text{T}\right]$ The fence vector $\text{F}$ acting on a proton with all electric charge of $\text{1}{\text{.6×10}}^{\text{-19}}\text{C}$ (in coulombs) moving in a magnetic field $\text{B}$ where the velocity vector $\text{v}$ is given by $\text{F=1}{\text{.6×10}}^{\text{-19}}\left(v\times B\right)$ (here, $v$ is expressed in meter per second, $\text{B}$ is in tesla $\left[\text{T}\right]$ , and $\text{F}$ is in newtons $\left[\text{N}\right]$ ). Find the force that acts on a proton that moves in the $xy$ -plane at velocity $v={10}^{5}i+{10}^{5}j$ (in meters per second) in a magnetic field given by $B=0.3j$ ).