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Welcome to Physics Homework and Study Help, where you can ask questions and receive help on learning physics. We currently focus on helping questions in introductory level college physics and high school AP Physics courses.
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Homework #8, Question #7

0 votes
98 views
Okay, so I watched the video for this one.

Part (a) - magnetic field moving to the right through the loop is decreasing, so nature wants to add that back in.

Right hand thumb point to the right.  Current will move up the back and over the top.  It appears this means the current would move from b to a; however in the video, he says this means it moves from a to b...

I'm guessing the confusion is in the drawing.. who is correct here?
asked Oct 22, 2014 in General by anonymous

1 Answer

0 votes
First, determine which right hand rule to use. In this case it would be the thumb going in the direction of the magnetic field of the bar magnet. Knowing that the magnetic fields on a bar magnet move from the South to the North poles you get the magnetic field going to the right, but by Lenz's Law there is a magnetic field that induces current in the coil by opposing the magnetic flux. Since you know the induced B field is to the left you use the same right hand rule to figure out current goes from a to b.
answered Oct 22, 2014 by jhb320034277 (140 points)
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