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Old Feb 14th 2010, 04:02 PM   #1
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Infinite Conductor within Infinite Conductor - Current Density between

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Old Feb 15th 2010, 01:30 AM   #2
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for question 3 I honestly have no idea where to start..I write down biot-savart law and I have no clue from there on lol

for question 4)

I know for an infinite conductor H = (I/2pi(rho))(aphi)

But I'm not sure how it works for different radiuses and what to do with the aphi (do I need to figure out a direction?)

Thanks!
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Old May 3rd 2010, 02:12 AM   #3
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magnetic field within the solid cylinder at any arbitrary distance r from centre can be found from ampere law.
now magnetic energy density=1/(2 mew zero) B^2
this is to be integrated within required limits.
the volume element may be chosen as r dr dtheta dz where z is the height and theta is the polar angle- ie. a cylindrical co ordinate system.
hope this helps...
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