6 Helical motion
Rationalised 2023-24
113
Moving Charges and
Magnetism
 EXAMPLE 4 3
Example  4 3   What is the radius of the path of an electron (mass
9 × 10-31 kg and charge 1 6 × 10–19 C) moving at a speed of 3 ×107 m/s in
a magnetic field of 6 × 10–4 T perpendicular to it