Doing Magnetism Problems Typical orientations of the magnetic

Doing Magnetism Problems

Typical orientations of the magnetic field u u Magnetic field is pointing in to the board Magnetic field is pointing out of the board

In what direction will the particles be deflected?

What about these particles?

Finally, what about these particles?

What about current? u It is just about impossible to examine what happens to a single charged particle as it moves through a magnetic field u Current is most often studied. u Allows us to see what happens when large numbers of charges pass through a magnetic field

Current and Magnetic Fields Instead of q, we will look at I, the amount of charge. u L represents the length of the loop in the magnetic field u B represents the magnetic field vector u

What will happen to the lengths of wire?

Some Things to Consider u u What are the units of the magnetic field? So the Tesla is the unit of magnetic field strength

What is the shape of the path made by a charged particle in a magnetic field? u Discuss u What happens to the direction of the force as the particle starts to turn? u So what is the shape?

Oh, the Circle of Life

Let’s Determine the Radius of Such a Circle u A particle with a mass of 6 g and a charge of 20 µC enters perpendicularly to a magnetic field of strength 24 m. T. The particle is moving with a speed of 40 m/s. a) Determine the magnetic force on the charge? b) What is the change in speed on the charge? c) What is the radius of the circle the charge makes?

The Force

The change in speed u What is the direction of the force in relation to the direction of motion at all times? u If the force is never in the direction of motion, what is the change in speed? u The change of speed is 0

The Radius of the Circle The magnetic force always acts at right angles to the motion of the charged particle causing a centripetal acceleration.

Radius of the Circle