A proton has a velocity that is intially at
to the field line. Its speed is 10 m/s and the magnetic field strength is 1.0
T. Find the radius of the circles and the distance between successive circles
in the helix.
The particle moves at constant velocity along the field line while orbiting around it. The path is a helix.
The period is
and thus the distance travelled along the field line in this time is: