The magnitude of AT required to establish a given value of flux in the airgap :

The magnitude of AT required to establish a given value of flux in the airgap will be much greater than that required for iron part of a magnetic circuit, because
(a) air is a gas
(b) air is a good conductor of magnetic flux
(c) air has the lowest relative permeability
(d) iron has the lowest permeability

Anurag Mishra Professor Asked on 1st February 2016 in Physics.
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    Answer: (c) air has the lowest relative permeability 

    Anurag Mishra Professor Answered on 21st May 2016.
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