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# magnetic field around box

Author Topic:   magnetic field around box
rage_11
Inactive Member

 Message 1 of 5 (40570) 05-18-2003 12:13 PM

Hello!

I would like to ask you for help. Im student from slovenia, im studying 1. year electrical
engeniring. I apology for my bad english. Im trying to calculate magnetic field around
box with measure a×b and length l, it is like cable which is not round but square.
I allready calculate magnetic field around flat with width a and length l,
and i get B(x) and B(y) ( used Biot-savart law). I wonder if I can sum up flats and then
i get field around "square cable"? I need expresion Of B(x) an B(y) and i have no idea
how to start.

 Replies to this message: Message 2 by Admin, posted 05-18-2003 6:45 PM rage_11 has not yet responded Message 4 by Perdition, posted 05-21-2003 4:52 AM rage_11 has responded

Director
Posts: 12613
From: EvC Forum
Joined: 06-14-2002
Member Rating: 4.4

 Message 2 of 5 (40595) 05-18-2003 6:45 PM Reply to: Message 1 by rage_1105-18-2003 12:13 PM

EvC Forum isn't the best place to pose this question, but I'm sure there are some electrical engineers here. I'm an EE myself, but I've forgotten more field theory than I ever learned.

I wonder if the geometry of your cable is irrelevant, and that it's instead the cross sectional area that you have to pay attention to. Or perhaps it's only the current that matters, though you don't mention current as part of the problem.

Your idea of integrating across the flats from 0 to b also sounds promising.

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 This message is a reply to: Message 1 by rage_11, posted 05-18-2003 12:13 PM rage_11 has not yet responded

Director
Posts: 12613
From: EvC Forum
Joined: 06-14-2002
Member Rating: 4.4

 Message 3 of 5 (40596) 05-18-2003 6:46 PM

Thread moved here from the Big Bang and Cosmology forum.
Perdition
Member (Idle past 1430 days)
Posts: 1593
From: Wisconsin
Joined: 05-15-2003

 Message 4 of 5 (40867) 05-21-2003 4:52 AM Reply to: Message 1 by rage_1105-18-2003 12:13 PM

magnetic field
If you are measuring the magnetic field outside of a magnetized box, the field at any given point is just the sum of the fields of each side. At least as far as I can remember from my physics class from last year

Good luck

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"Of course...we all create god in our own image" - Willard Decker, Star Trek: The Motion Picture

 This message is a reply to: Message 1 by rage_11, posted 05-18-2003 12:13 PM rage_11 has responded

 Replies to this message: Message 5 by rage_11, posted 05-22-2003 5:32 PM Perdition has not yet responded

rage_11
Inactive Member

 Message 5 of 5 (41051) 05-22-2003 5:32 PM Reply to: Message 4 by Perdition05-21-2003 4:52 AM

Re: magnetic field
Hello!
The box is not empty:-)
otherwise it wouldnt be a problem.
 This message is a reply to: Message 4 by Perdition, posted 05-21-2003 4:52 AM Perdition has not yet responded

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