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December 9th, 2009, 07:38 AM   #1
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Induced emf problem

A large cylindrical loop of 288 turns and radius 67.0 cm carries a current of 70.0 A. A small square loop of 36 turns and 1.00 cm on a side is placed at the center of the large loop. If the current in the large loop drops to 0 in 0.0470 s, find the induced emf in the small loop. (Assume that the magnetic field in the region of the square loop is uniform.)
dynas7y is offline  
June 8th, 2010, 10:51 AM   #2
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Re: Induced emf problem

N(magnetic flux) = N(BA) where B is the magnetic strength, N is the number of turns and A is the Area

B (magnetic strength) = (I)/2?R where is the permitivity of free space, I is the current and R is the radius from the center of the wire.

A=Qt where Q is the charge and t is the time

Can you move on from here.

Also, by lenz's law, the current induced in a wire tends to oppose normal direction when flux changes or the magnetic strength changes
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June 10th, 2010, 06:18 AM   #3
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Re: Induced emf problem

Lets take a step back

Can you move on from here?

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