Question

If an electron and a proton having same momenta enter perpendicular to a magnetic field, then(a) curved path of electron and proton will be same (ignoring the sense of revolution)(b) they will move undeflected(c) curved path of electron is more curved than that of the proton(d) path of proton is more curved

Answer 1

a should be the answer

Answer 2

Answer:

A) Curved path of electron and proton will be same

Explanation:

Since the momentum of the electron and proton are same and masses of electron and proton are different, so they will attain different velocities and therefore experience different forces.  

But the radius of a circular path depends on momentum so both will be moving on the same trajectory which is the curved path. The effective radius of a circular path in a magnetic field depends on the considerable momentum and in the said question both maintain the same momentum. Therefore, they will have the same curved path.