Question

a proton and an alpha particle (the nucleus of a helium atom, containing two protons and two neutrons) traveling at the speed enter a uniform magnetic field. The velocity vector of each particle is perpendicular to the magnetic field. What is the ratio of the radii of their circular orbits (r proton/r alpha) ?

~ 0.5

~ 1.0

~ 1.5

~ 2.0

~ 4.0

Answer 1

Option A is correct

met or ma-ump ma Also kwe know Vx 2 Up that for a charged particle field in Mag. mo qB 82 radice of path 1 - reelocity, q = charge m= mals B = Mag, field Here for proton &= mpro up B V = more qbe B o for X-Particle Dividing by 2 rea тр Як — уурх 2р. ma VP 4mpx V re=0.5 ra mpre UPB val 2 ra