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Magnetic field strength dependent on distance from source 
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#19
Feb2213, 06:09 AM

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P: 11,864

See here for the magnetic field along the axis of a finite solenoid:
http://www.phys.uri.edu/~gerhard/PHY204/tsl215.pdf This assumes the solenoid has no iron or other magnetic material inside it. 


#20
Aug113, 01:13 PM

P: 2

Thank you all for the help on this little project!
I have to apologize about the delay for my thanks. School became overwhelming so I had to put this on hold. I reviewed the info you all provided, along with a great text a professor lent me. While not one of those individual sources described exactly my situation, I was able to synthesize it all into a decent model to describe my data. Thanks again! 


#21
May1614, 10:19 AM

P: 6

Hi everyone,
I am trying to use the 1/r^3 formula to calculate the decrease in magnetic field strength over distance, but I must be doing something very, very wrong following this formula because the numbers I get don't make sense to me. I have clearly made a mistake applying the formula and I am wondering if someone could tell me where I have gone wrong. I am trying to calculate how a field of 0.005 Tesla will decrease at a distance of 0.0005 meters away. I have done the following calculation 0.005T/0.0005^3 meters, which gives me the number 0.005/0.0005^3 = 40,000,000 Obviously I have gone horribly wrong, and I have a feeling I am making a very basic mistake somewhere with either the calculations and/or the understanding of the formula. If any kindhearted charitable soul out there wants to tell me how this poor fool has gone wrong, I would be very grateful! 


#22
May1614, 11:23 AM

PF Gold
P: 963




#23
May1614, 03:04 PM

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P: 12,053

Those 40000000T would be the magnetic field at this distance if you had a pointlike source that has a field of 0.005 T in a distance of 1m. Such a source is completely unrealistic. By the way: please start a new thread if other threads are several months old. 


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