A toroid has `2000` turns. The inner & outer radii of its core are `11cm` and `12cm` respectively. The magnetic field in the core for a current of `0*7A` is `2*5T`. What is relative permeability of core?

A toroid has `2000` turns. The inner & outer radii of its core are `11

1.	A toroid has `2000` turns. The inner & outer radii of its core are `11cm` and `12cm` respectively. The magnetic field in the core for a current of `07A` is `25T`. What is relative permeability of core?
Answer» Correct Answer - `10269` Mean radius `=r=(11+12)/(2)=115cm` `=115xx10^-2m` `:.` No of turns/length `n=(N)/(2pir)=(2000)/(2pixx115xx10^-2)` As `B=munI`, where `B=25T` and `I=07A` `:. mu=(B)/(nI)=(25xx2pixx115xx10^-2)/(07xx2000)` `=1291xx10^-4TmA^-1` `mu_r=(mu)/(mu_0)=(1291xx10^-4)/(4pixx10^-7)=10269`

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A toroid has `2000` turns. The inner & outer radii of its core are `11cm` and `12cm` respectively. The magnetic field in the core for a current of `0*7A` is `2*5T`. What is relative permeability of core?

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A toroid has `2000` turns. The inner & outer radii of its core are `11cm` and `12cm` respectively. The magnetic field in the core for a current of `07A` is `25T`. What is relative permeability of core?