Why we use #mu_0# for air when calculating the magnetic flux density inside an electric cable where (r<R) instead of the permeability of the metal core #mu#. #" "# #B=(mu_0Ir)/(2piR^2)#?

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Why we use #mu_0# for air when calculating the magnetic flux density inside an electric cable where (r<R) instead of the permeability of the metal core #mu#. #" "# #B=(mu_0Ir)/(2piR^2)#?

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Answer 1 · 2018-04-24T02:52:03

You are correct.

We should use #mu(=mu_0mu_r)# in the formula.

Having said we also observe that most non-ferromagnetic substances (such as wood, plastic, glass, bone, copper, aluminum, air and water) have a permeability almost equal to #μ_0#, as their relative permeability #mu_r~~1.0#

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Why we use #mu_0# for air when calculating the magnetic flux density inside an electric cable where (r<R) instead of the permeability of the metal core #mu#. #" "# #B=(mu_0Ir)/(2piR^2)#?

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