Question

An electron and a proton are moving with the same speed enter the same magnetic field

Answer 1

Then they both posses diffrent force and form diffrent radii

Let radii of electron be r
and radii of proton be r'

mass of electron be m
mass of proton be m'
So,

$r = \frac{mv}{qB}$
$r' = \frac{m'v}{qB }$
m'>m

so

r' > r.

Radius of proton will be more than radius of electron