An electron moves in a circular path perpendicular to a magnetic field of magnitude $0\mathrm{.}290$ T$.$ If the kinetic energy of the electron is $4\mathrm{.}701019$ J$,$ find the speed of the electron and the radius of the circular path.

$($a$)$ the speed of the electron

m$/$s

$($b$)$ the radius of the circular path

Your response differs from the correct answer by more than $10\%.$ Double check your calculations. $$m