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Re: EM Induction - A conceptual question



interesting

And if we had a cylinder of type-I superconductor carrying a sheet of
current could we calculate the 'leakage rate' for a finite (but long)
'solinoid' of this construction.

Perhaps my 'belief' in lines of flux won't stay as firm as it has
been, but I need a little more visualization of what's happening here.

At 2:21 PM -0400 on 4/18/02, Carl E. Mungan wrote

Consider an infinitely long solenoid. The field at some interior
point is B (=u0*n*I as usual). Say the point is on the axis. Slice
the solenoid in half at that point. By symmetry, both the left
semi-infinite half and the right semi-infinite half must make equal
contributions to B. Hence, the field on the axis at the end of a
semi-infinite tightly-wound solenoid is B/2.
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