The core of a solenoid is made of material of relative permeability ?r. A small

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Question
The core of a solenoid is made of material of relative permeability ?_r. 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
Options
A. the fields inside and outside the cavity must be equal
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. none of the above

Correct Answer

the field inside the cavity must be made stronger than field outside the cavity

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Options
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