A Proton and a Deuteron Are Moving with Equal Velocities

Multiple Choice

A proton and a deuteron are moving with equal velocities perpendicular to a uniform magnetic field.A deuteron has the same charge as the proton but has twice its mass.The ratio of the magnetic force on the proton to that on the deuteron is:

A) 0.5.
B) 1.
C) 2.
D) There is no magnetic force in this case.