An alpha particle (2 protons and 2 neutrons) is moving at a constant speed in a circle, perpendicular to a uniform magnetic field applied by some

An alpha particle (2 protons and 2 neutrons) is moving at a constant speed in a circle, perpendicular to a uniform magnetic field applied by some current carrying coils, making on clockwise revolution every 80 nanoseconds. If the speed is small compared to the seed of light, what is the numerical magnitude B of the magnetic field made by the coils? What is the direction of this magnetic field?