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Q.31

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 796

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Short Answer

The microwaves in a microwave oven are produced in a special tube called a magnetron. The electrons orbit the magnetic field at , and as they do so they emit electro-magnetic waves.

a. What is the magnetic field strength?

b. If the maximum diameter of the electron orbit before the electron hits the wall of the tube is , what is the maximum electron kinetic energy?

Part a

a)The strength of the magnetic field is

Part b

b)The maximum electron kinetic energy is

See the step by step solution

Step by Step Solution

 Step :1 Introduction

The given is the circular frequency and the diameter of the chamber is . The objective is to find the magnetic field strength and energy.

Step :2 Magnetic field (part a)

a) The magnetron motion is the uniform circular motion of a particulate perpendicular to the magnetic field at a constant speed. The magnetic field causes the circular motion to produce a circular frequency, which is given by an equation in the form

Where is the particle's charge, is the magnetic field, and is the particle's mass. The frequency is determined by the magnetic field rather than the particle's velocity, as indicated by the equation. For , we rearrange the equation so that it looks like this:

Now, we plug the values for , and of the electron to get

Step :3 Electron (part b)

b) The radius of the circular motion produced by the magnetic field is related to it by an equation in the form

The diameter of the chamber is , so we get the radius by

We rearrange the equation for the speed and plug the values for to get the speed of the electron

The kinetic energy is half the product of the mass and the velocity square

Now, we plug the values for and into the equation to get of the electron

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