Electrons moving with different speeds enter a uniform magnetic field in a direction perpendicular to the field. They will move along circular paths

Options

A. of the same radius
B. with larger radii for the faster electrons
C. with smaller radii for the faster electrons
D. either (b) or (c) depending on the magnitude of the magnetic field.

Answer

B

Explanation

`(mv^(2))/( r)=Bqv` or mv= Bqv or r=`((m)/(Bq))v`
As m,q and B are the same for all the electrons,`rpropv`