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1. The core of a solenoid is made of material of relative permeability μr. A small cavity area dA and length dl is cut in the core. If it is desired that flux density in the cavity should be equal to B0
(A): none of the above
(B): the field inside the cavity must be made stronger than field outside the cavity
(C): the field inside the cavity must be made weaker than the field outside the cavity
(D): the fields inside and outside the cavity must be equal
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