Question

when an electron and a neutron are moving through uniform magnetic field with velocity 'v' perpendicular to the direction of magnetic field 'B' which particle deflects? why? what is the path of the deflected particle?

Answer 1

When an electron and a neutron are moving through uniform magnetic field with velocity 'v' perpendicular to the direction of magnetic field 'B' , then only electron will deflect because it has a negative charge and as neutron is neutral with no charge hence Force on neutron also will be zero.
∵ F=qVB
since q=0, F=0

Let us assume that the field is directed into the page..Then the Force experience by charge particle is:
F=qVB.
As we know that the force is always directed perpendicular to velocity. Hence the particle moves along a circular path
and the magnetic force on a charged particle acts like a centripetal Force.