An electron, a proton and a deuteron move in a magnetic field with same momentum perpendicularly. The ratio of the radii of their circular paths will be -

A proton, a deuteron and an alpha - particle are accelerated by the same potential and then enter a uniform magnetic field perpendicularly. The ratio of radii of their circular paths will be

A proton, at deuteron and an alpha -particle are projected perpendicular to the direction of a uniform magnetic field with same kinetic energy. The ratio of the radii of the circular paths described by them is

An electron and a proton have equal kinetic energies. They enter in a magnetic field perpendicularly, Then

An electron and a proton have equal kinetic energies. They enter in a magnetic field perpendicularly, Then

A moving electron and a moving proton enter a uniform magnetic field in a direction perpendicular to that of the field. If the radii of their circular orbits are equal, they have the same

An electron and a proton have equal kinetic energies. They enter in a magnetic field perpendicularly, then