A proton of energy `200 MeV` enters the magnetic field of `5 T`. If direction of field is from south to north and motion is upward, the force acting on it will be

A proton of energy 8 MeV enters a uniform magnetic field of 5T at right angles to the field. What is the magnetic force acting on proton ?

A proton enters a magnetic field parallel to the direction of the field. Then, the path followed by it is

A 5 MeV proton moves vertically downward through a magnetic field of induction 1.5 "weber"//m^(2) pointing horizontally from south to north. The force acting on the proton, mass of proton = 1.6 × 10–27 kg . will be

A proton and an alpha-particle enter a magnetic field in a direction perpendicular to it. If the force acting on the proton is twice that acting on the alpha-particle , the ratio of their velocities is