Alexandr A.Shpilman (alexandrshpilman78@gmail.com )
SchizoRoom for physicists
In traditional
education teachers frequently do not understand what they are teaching so
students do not understand what they should remember but they have strong
Belief that overseas knowledge’s is completely
confirmed by practice. Let’s try to force us to doubt in the last based
on the paradoxes.
“Moebius strip”
I wonder
how to draw magnetic field lines along an iron strip of metal rolled up into a
“Mobius strip” M. If the magnetic field in the strip is created by the
coil current L ?
|
|
And as a
result, it is not clear how to calculate the inductance of a coil L with
such a magnetic core M. There is a standard formula for calculating the
inductance of coils with a magnetic core:
Li
= k*µ*n2 /(l/S)
k – some coefficient,
µ – magnetic permeability
of the magnetic tape,
n – number of turns of the coil L,
l – length of the
magnetic field line in the magnetic core of the coil,
S – cross-sectional area
of the magnetic core of the coil.
But
the question arises, what is the length of the magnetic field line in the core
of the coil from a magnetic tape folded into a “Mobius strip”? l - is equal to single or double the
length of the iron strip? If double, then S will have to choose two
times less? As a result, we have two options for the inductance of the coil L,
which differ by a factor of four.
As
in the article "SchizoRoom for physicists", another problem
arises in the application of such a concept as "magnetic field". Therefore,
to reduce the number of paradoxes, it is worth using the concept of “magnetic
vector potential”.