A straight conductor of length l and carrying a steady current I
experiences a force F in a uniform external magnetic field B,
F = I l × B
where|l| = l and the direction of l is given by the direction of the
current 3 In a uniform magnetic field B, a charge q executes a circular orbit in
a plane normal to B Its frequency of uniform circular motion is called
the cyclotron frequency and is given by:
2
c
q B
m
ν =
π
This frequency is independent of the particle’s speed and radius