December 9th, 2009, 06:38 AM  #1 
Newbie Joined: Dec 2009 Posts: 4 Thanks: 0  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.)

June 8th, 2010, 09:51 AM  #2 
Senior Member Joined: Jan 2009 Posts: 345 Thanks: 3  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) = (µI)/2?R where µ 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 
June 10th, 2010, 05:18 AM  #3 
Senior Member Joined: Jan 2009 Posts: 345 Thanks: 3  Re: Induced emf problem Lets take a step back Can you move on from here? 

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