Question

magnetron. The electrons orbit in a 5. (20pts) The microwaves in a microwave oven are produced in a magnetron. The electrons magnetic field at a frequency of 2.4GHz (2.4x10^9 Hz) and as they do so they emit 2.40 electromagnetic radiation (light). What is the strength of the magnetic field? Hint: Assume the electrons move in a circle of radius R (the radius will cancel out in the end). Compare your result Earth's magnetic field.

Answer 1

Frequency of orbital motion of electron is given by

$f = \frac{qB}{2 \pi m}$

Therefore,

$B= \frac{2 \pi mf}{q}$

(10 * 24) (ان-10 * 9 . 1) 2 1.6* 10-19

= 0.086 T

​​​​​​average magnetic field of earth is approximately 45×$10^{-6}$ T

Dividing the two fields,

Magnetic field in microwave is about 2000 times stronger.