If self induction of an air core solenoid increases from 0.04 mH to 16 mH on introducing an iron core into it, what is relative magneitc permeability the core ?

If self induction of an air core solenoid increases from 0.04 mH to 16

1.	If self induction of an air core solenoid increases from 0.04 mH to 16 mH on introducing an iron core into it, what is relative magneitc permeability the core ?
Answer» As `L_(0) = (mu_(0) N^(2) A)/(l)` and `L = (mu N^(2) A)/(l)` `:. mu_(r) = (mu)/(mu_(0)) = (L)/(L_(0)) = (16)/(0.04) = 400`

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If self induction of an air core solenoid increases from 0.04 mH to 16 mH on introducing an iron core into it, what is relative magneitc permeability the core ?

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