Warming up on Magnetic Sources

This assignment is due before 9 AM, Monday, October 23rd, 2000.

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The following three questions refer to the material you were to read in preparation to the lesson. Questions one and two require you to write a three or four sentence response. Number three is a multiple choice question. Click in the appropriate circle.

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT HOMEWORK button at the bottom of this page.

WarmUp questions are worth 5 points each towards your "Homework and Web Assignments" score (250 points total).




1.

Today's class will focus on the field of a circular current loop. This subject is discussed at length in section 29-6 of your text. In the past, many students have found this section to be confusing. Your assignment for today is to provide two questions about this topic for the lecture discussion.



2.

At the northern magnetic pole (roughly at Latitude 80.1 N, Longitude 107.41 West), the Earth's magnetic field has a magnitude 5.71 x 10-5T, and points straight down into the "frozen tundra." If you assume that all of this field is due to a current loop around the center of the Earth, 3000 miles in diameter, what does the current have to be?

Hint: Don't forget to use consistent units.





3.


Two long parallel wires are separated by 0.2 meters and carry currents of 3 and 5 amps as shown in the figure. What can we say about the force on wire #2?

There is no force on wire #2

The force on wire #2 is towards wire #1

The force on wire #2 is away from wire #1

The force on wire #2 is into the page

The force on #2 is out of the page

There is no force on #2 but there is a torque.

Below is a space for your thoughts, including general comments about today's assignment. What was hard or confusing (or cool)? What would you like to spend extra time on in class? Do you see how this subject fits in with the others we have discussed?




You may change your mind as often as you wish. When you are satisfied with your responses click the SUBMIT button.

I received no help from anyone on this assignment.



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