Question about concentric solenoids and magnetic fields...

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Bkas

Member
Jul 24, 2002
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One more...if you take one wire and wrap it into two concentric solenoids (so you have two concentric solenoids connected by a wire (i guess that means in series) with same current I) such that current I is flowing oppositely in both (both solenoids are also of finite length), how does one go about finding the self-induced flux? I keep thinking you would have to find the self induced flux of one based on the other, but the question just ask for generic self induced flux? Also, for B-field, so you just do it like you normall would, but add by superposition (for inside the smaller solenoid, etc.)? And at very far distances, would it act like a dipole? 'Cause I know in the immediate outside vicinity, there is no b-field outside of both...
 
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fizmeister

Senior member
Oct 29, 2002
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Yes, to find B-field, you add by super position.

And, yes, I think (I could be wrong) it would act as a dipole at large distances...in the nearby immediate vicinity (granted it's a finite solenoid), there should be zero b-field, but at large distances, it would wrap around (even like the world) and act like a dipole.

As far as flux goes, I'm not sure. I'm sort of weak in E/M. I have an exam coming up on similar stuff, so I'll probably study electromagnetism theory in more detail and if I remember, come back and respond. Hopefully, someone else will in the meantime.

Good luck!

to wfbberzerker: i don't know if you'd consider this "highly technical"...a lot of people that know physics may not visit the highly technical, and this seems to be more theory non-technical based...also, it doesn't have much to do with technology and computing, which is what that forum is for.
 
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