## Due before class Friday, Jul 6th

Physics 106, Summer 2012

Did you complete the reading assignment?

Yes
No

Did you complete the entire quiz or spend at least 15 minutes working on this quiz and the attached links?
Yes
No

## KEY CONCEPTS:

1) Magnetic forces and fields are vectors.

2) A magnetic force is present when a magnetic object is placed in a magnetic field.

3) There are no magnetic monopoles.

Like gravitational fields and electric fields, magnetic fields are vector fields. They surround magnets and are detected by the forces they exert on moving electric charges and on magnetic materials. Magnetic poles are called north and south poles, with opposite poles attracting each other. They are NEVER isolated from each other; magnetic poles are always physically connected with a north and south end and are generally referred to as dipoles. These magnetic dipoles will have their axes parallel to the magnetic field when they are placed in one. This is the basis on which a compass works, with the magnetic needle aligning itself with the Earth's magnetic field.

On the simulation, you can think of the red tips of the magnetic field lines as the arrow heads, and the white tips of the magnetic field lines as the arrow tails.

Which direction do magnetic fields point while outside of a magnet?

North to South
South to North

Click on the 'see inside magnet' option in the box to the right. Which direction do magnetic fields point while inside of a magnet?

North to South
South to North

Click on the 'show field meter' option in the box to the right. Drag it around different parts of the screen.

Is a magnetic force stronger or weaker near a magnet?

Stronger
Weaker

Now drag the magnetic field meter around the edges of the magnet. Where is the magnetic field the strongest?

Click on the 'show planet Earth' option in the box to the right. Why does the magnetic north end of the compass (the red end) point to the north side of the Earth?

FEEDBACK

The comments entered in these last two boxes go into a big anonymous data file that I will use to guide the lectures of the day. That means two things:

1) If you have a specific question or concern and would like an individual answer you will need to come by the office or send an email.
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Was there anything that you didn't understand in the reading assignment?  What was confusing to you?