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Magnetic Field around a dipole calculation

by crystalbrite
Tags: calculation, dipole, field, magnetic
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crystalbrite
#1
Oct22-11, 03:40 PM
P: 5
1. The problem statement, all variables and given/known data
I've attached a page from the book Elements of Electromagnetics.

I was wondering how he gets from eq.8.20 to eq.8.21a.

What I would have done is sub in dl=a.d∅.a∅ and integrate ∅ between 0 and 2pi.

This would then give you A=[(2.μ0.I.pi.a)/(4.pi.r)].a

This is obviously wrong because it's not what he got. He does make an assumption that r>>a so maybe i have to do something with that.

Any help would be much appreciated

Thanks
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crystalbrite
#2
Oct22-11, 03:45 PM
P: 5
I think i forgot the attachment
Attached Thumbnails
electromagnetics page.jpg  
crystalbrite
#3
Oct23-11, 10:47 AM
P: 5
Its ok, i found the explanation in a book on google books. Its a bit long and tedious.

I guess no one here would be able to understand it which is why i got no reply. Oh well...


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