6.5 Electron beams

Question 1

How do electron guns distribute kinetic energy

Answer 1

They give each electron a kinetic energy to the product eV

Question 2

How does magnetic force affect the path of an electron

Answer 2

The magnetic force acts perpendicular to both B and v, and this makes an electron move in a circular path. the magnetic force forms the centripetal force needed for circular motion

Question 3

Why is there no work done on the electrons and what does this mean for the kinetic energy and the speed

Answer 3

Bev is always perpendicular to the path of electrons, no work is done on them. Because of this their kinetic energy and speed as they move in a circle remain constant