Warming up on Magnetic Forces

This assignment is due before 9 AM, Wednesday, October 18th, 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.

The text includes the formula dF = I dl X B (bold type indicates vectors). Describe what l means in this formula and state what feels the force. Also, in what situations is this formula not valid?



2.

Estimate the force of the earth's magnetic field on a 10 cm segment of a typical wire in your home.

Hint: In Indianapolis, the Earth's magnetic field has a magnitude of about 5.5 x 10-5 T.





3.


If a loop of wire carrying a uniform current feels a net force due to a magnetic field which of the following must be true?

The magnetic field is perpendicular to the plane of the loop.

The magnetic field is in the plane of the loop.

The magnetic field is constant over the loop.

The magnetic field is not constant over the loop.

None of the above conditions are really necessary.

It is impossible for a loop to feel a net force no matter what.

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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