A neutron, a proton , and an electron and an alpha particle enter a region of constant magnetic field with equal velocities . The magnetic field is along the inward normal to the plane of the paper . The tracks of the particles are labelled in fig. the electron follows track .... and the alpha particle follows track.....

Answer

d,b

Explanation

Z Path C is undeviated. Therefore, it is of neutron’s path. Form Fleming’s left hand rule magnetic force on positive charge will be leftwards and on negative charge is rightwards. Therefore, track D is of electron. Among A and B one is of proton and other of `alpha`-particle.
Furtehr `r=(mv)/(Bq)` or `r prop m/q:.gamma_(alpha)gtgamma_(p)`
Or track B is of `alpha` -particle