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Re: EM Induction - A conceptual question



PHYS-L@lists.nau.edu writes:
Will the change in the magnetic field strength induce a current (emf=
)
in the loop?

By the Faraday's law there should be an emf induced becuse of changin=
g
flux. However, my contention is that B-field lines are not "physical=
ly"
linked to the loop. Why should changing field affect anything in the
loop? =20

There will other wiser responses but...

Magnetic fields and electric fields are related by the fact that changing
one at a point in space will produce the other in that region of space and
perpendicular to the changing field. I have no idea of why this happens,
but it does.

Thus as the magnetic field in the loop changes an electric field, in a
plane perpendicular to the magnetic field, will arise that will be able to
drive charges to move in the loop.

I find the whole thing wonderfully magical and that we can use the flux
concept to treat it mathematically is very nice!

Happy Friday.....only 2 more days in the working week!

Ken Fox
Science Department Coordinator
IB Physics Teacher
Smoky Hill High School
Aurora, CO
kfox@mail.ccsd.k12.co.us