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Re: Lenz's Law



The induced current always OPPOSES the change in the magnetic flux. For
example, if the magnetic field is INCREASING UPWARDS through a horizontal
loop of wire, the current will be induced CLOCKWISE (as viewed from above)
in the loop so as to produce a downwards field that would oppose the
increasing B field. If the field is upwards through the loop but is
decreasing, then the induced current would be counter-clockwise to try and
support the upwards B field.

Rick

*********************************************************
Richard W. Tarara
Professor of Physics
Saint Mary's College
Notre Dame, Indiana
rtarara@saintmarys.edu
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Free Physics Educational Software (Win & Mac)
www.saintmarys.edu/~rtarara/software.html
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----- Original Message -----
From: "Tina Fanetti" <FanettT@WITCC.COM>
To: <PHYS-L@lists.nau.edu>
Sent: Thursday, February 27, 2003 3:21 PM
Subject: Lenz's Law


Hello
Today I was covering Lenz's law in class. I was doing an example and I
got all confused and couldn't get the current going the right way.

How do I figure out which way the induced current is going? I have looked
in 4 books and they all use the same example. Haliday, Resnick, Walker use
I different right hand rule..
the more I read and try to figure out the worse it gets....

Help Please
Tina (feeling dumb)

Tina Fanetti
Physics Instructor
Western Iowa Technical Community College
4647 Stone Ave
Sioux City IA 51102
712-274-8733 ext 1429