Warming up on Faraday's Law

This assignment is due before 9 AM, Wednesday, November 1st, 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.

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1.

Lenz's Law is said to be a consequence of the principle of conservation of energy. Explain this statement by describing what would happen if Lenz's Law were reversed. Take the example of a wire loop with a changing magnetic flux, and describe what would happen if current were induced opposite to the way it really is.



2.

Let's say you take an ordinary wire coathanger and straighten out the hook shaped part that normally hangs over the coatrack. Now, you can spin the (roughly) triangular part around by twisting the straightened part between your fingers. Estimate the EMF that you can generate by spinning the hanger in the Earth's magnetic field (about 5 x 10-5 T).





3.


A uniform magnetic field can produce an EMF in a conducting loop if...

a) The field changes in magnitude

b) The loop changes position within the field.

c) The loop rotates within the field

d) The loop is removed from the field.

e) The loop changes size.

e) All of the above.

f) All except b)

g) All except c)

h) All except d).

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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