Question

An electron moves at some arbitrary angle to the magnetic field direction ( B is in + zˆ direction). The trajectory is a helix with some pitch d. Considering the velocity of an electron in XY plane v and in +z direction vz find d. Hint – consider XY and Z motion independent and calculate the period of circular motion.

Answer 1

T = d/vz

Step-by-step explanation:

Considering the velocity of an electron in +z direction = vz

Pitch = d

The period of circular motion = T = ?

We can use the formula

d = T*vz

then, the period T is

T = d/vz