At what speed $($in m$/$s$)$ will a proton move in a circular path of the same radius as an electron that travels at $7\mathrm{.}35106$ m$/$s perpendicular to the Earth's magnetic field at an altitude where the field strength is $1\mathrm{.}15105$ T$?$

m$/$s

$($b$)$

What would the radius $($in m$)$ of the path be if the proton had the same speed as the electron?

m

$($c$)$

What would the radius $($in m$)$ be if the proton had the same kinetic energy as the electron?

m

$($d$)$

What would the radius $($in m$)$ be if the proton had the same momentum as the electron?

m