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The magnetic induction and the intensity of magnetic field inside an iron core of an electromagnet are `1 Wbm^(-2)` and `150Am^(-1)` respectively. The relative permeability of iron is : `(mu_(0)=4pixx10^(-7)"henry"//m)`A. `(10^(5))/(6 pi)`B. `(10^(5))/(pi)`C. `(10^(5))/(3 pi)`D. `(10^(5))/(5 pi)` |
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Answer» Correct Answer - B The permeability is given by `mu = B//H` `:.` Relative permeability `mu_(r)=(mu)/(mu_(0))=(B)/(mu_(0)H)=(10)/(4pixx10^(-7)xx250)=(10^(5))/(pi)` |
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