December 9th, 2009, 07:38 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, 10:51 AM  #2 
Senior Member Joined: Jan 2009 Posts: 344 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, 06:18 AM  #3 
Senior Member Joined: Jan 2009 Posts: 344 Thanks: 3  Re: Induced emf problem Lets take a step back Can you move on from here? 

Tags 
emf, induced, problem 
Search tags for this page 
Click on a term to search for related topics.

Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Graphs without induced subgraphs with 3/4 edges?!  MageKnight  Applied Math  0  January 15th, 2013 07:59 AM 
Induced Subgraphs (Graph Theory)  Kramer  Real Analysis  1  August 2nd, 2012 10:39 AM 
Spanning and Induced Subgraphs  dynas7y  Applied Math  1  December 9th, 2009 07:54 AM 
I wrote this in a drug induced trance...what does it mean?  3Arctan1  New Users  21  October 9th, 2009 04:57 PM 