Bewley and flux linkage
From: V.K.Tamhane (vktamhane12_at_rediffmail.com)
Date: 06/18/04
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Date: 18 Jun 2004 03:06:04 -0700
Should we derive concept out of a mathematical equation or should we
apply maths to concept? Former can mislead us. Here is a small
example. ('Flux linkages and electromagnetic induction' by L.V.Bewley)
Consider a transformer core with round cross section. Equation
for emf is,
e = - d(N)(fi)/dt
Normally we have fixed number of turns N. If N is also variable
then,
e = -(fi) d(N)/dt – (N) d(fi)/dt
Where fi is the instantaneous value of the magnetic flux in
the core. If we keep the value of flux constant then we get,
e = - (fi) d(N)/dt.
Bewley actually conducted an experiment to measure e when flux
was kept constant. Arrangement was made to rotate an insulating
cylinder, placed on the core limb. Bare conductor end was fixed to a
brass ring at one end and the wire was fed from a spool. Groves on the
cylinder kept off turns from touching each other. When cylinder was
rotated, there was continuous increase in the number of turns. Emf was
measured at brushes, one on the ring and other on the wire coming from
the spool. No emf was observed.
But the electrical circuit was continuously subjected to the
change in flux linkage. Such an apparent change in the flux linkage
cannot generate emf. There is no change in the magnitude of flux in
its own frame and no mechanism by which magnetic energy can be
transferred to the charges in the surrounding circuit. Relative motion
does not play any part in the real world.
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This is one article out of a serial. New visitors should go through
all the previous. Dates are posting dates. Articles are posted to 1.
Alt.sci.physics.new-theories 2.Sci.physics 3.sci.physics.electromag
4. sci.physics.relativity
1. Limitation of Divergence theorem 8-3-04 1,2,3,4
2. Electron positron annihilation 12-3-04 1,2,3,4
3. Changing magnetic field does
not produce electric field 17-3-04 1,2,3,4
4. Barnett's experiment 22-3-04 1,2,3,4
5. Relativity and electrodynamics 25-3-04 1,2,3,4
6. Relativity of two moving charges 2-4-04 1,2,3,4
7. Relativity of steady charge and current 11-4-04 1,2,3,4
8 Relativity of two currents 14-4-04 1,2,3,4
9. Nature of electric field 16-4-04 1,2,3,4
10. Magnetic field is real 22-4-04 2,3,4
11. once more relativity 5-5-04 1,2,3,4
12. A new paradox in SR 10-5-04 1,2,3,4
13. Ampere's law proves reality of magnetic field 17-5-04 1,2,3,4
14 Magnetic field acts at a distance 21-5-04 1,2,3,4
15. Magnetic field energy 25-5-04 1,2,3,4
16. Current without magnetic field 30-5-04 1,2,3,4
17. Properties of the magnetic field 5-6-04 1,2,3,4
18. Magnetic field never produces electric force 8-6-04 1,2
19. Faraday's disc and flux linkage 11-6-04 1,2,3,4
20. Magnetic field and relative motion 15-6-04 1,2,3,4
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