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Hi,
thanks for the comments. I agree that the question is quite bad. I think
that the intention of the examinors was the following:
When there is a changing magnetic flux through a conducting loop, an emf
is induced and in this case a current as well. The current has an
associated magnetic field which must oppose the change in the magnetic
flux. If it didn't, it would contribute to the change in magnetic flux and
subsequently create a greater induced current. This would violate the law
of conservation of energy.
John D. is right in writing "One of the standard tricks for gaming the
test uses the "principle" stated by Sherlock Holmes: when you have
eliminated the impossible, whatever
remains, however improbable, must be the truth." I hope that questions in
fortcoming exams will be of higher standard.
Regards,
Antti
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Viesti on tarkastettu roskapostinsuodatus- ja virustorjuntaohjelmistolla.
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