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OpenStudy (anonymous):
What is the source of the magnetic field in a permanent magnet? A. the spin and orbital motion of electrons B. long-range electric currents that are always present in iron C. net electric charge at the poles of a magnet D. the motion of iron nuclei
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OpenStudy (michele_laino):
it is option A
OpenStudy (michele_laino):
that's the Ampere theory
OpenStudy (michele_laino):
more explanation: a circular current generates a magnetic dipole
OpenStudy (anonymous):
ohhh ok! :) thanks!
OpenStudy (michele_laino):
and we can know the magnitude of the magnetic field due to a single magnetic dipole
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OpenStudy (michele_laino):
:)
OpenStudy (anonymous):
ahh okie yay!:) thanks!!
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