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Warming up on...   Magnetic sources

This assignment is due before 9 AM, Wednesday, October 3rd, 2007.

Please type your last name and first initial (e.g., Rader, A):

Please type a nickname: (in case your answer gets used in class).



The following questions refer to the material you were to read in preparation to the lesson. Please write a three or four sentence response to each of the questions.

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 4 points each towards your "WarmUps" score (100 points total).




1.

The direction of a magnetic field from a straight current can be determined by a version of the "right hand rule" illustrated on page 1071 of our text (Fig. 28-6). Please explain how this "right hand rule" is related to the "right hand rule" that you use to deal with the cross product in equation 28-6. (page 1069).


2.

Estimate the maximum possible magnetic field that could be produced by an electric toaster at a distance of 50 cm.

Hint: Assume the toaster uses 1000 W of electric power all in the form of a single wire operating at 120 V. (You need not worry about the fact that a real toaster uses AC power).



3.

How does the magnetic field of an infinite current carrying wire depend on distance from the wire? Compare to the electric field of a charged wire. Does this suggest any possibilities about, say, a current carrying plane? A very short (pointlike) segment?

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.



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