what is this and what is permeability.....
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In electromagnetism, permeability is the measure of the resistance of a material against the formation of a magnetic field, otherwise known as distributed inductance in transmission line theory. Hence, it is the degree of magnetization that a material obtains in response to an applied magnetic field.
this is for permeability
this is for permeability& u have written it's not understandable please write it clearly as by looking it looks like a formula in which I1 & I2 are the current & d is diameter.
hope I had helped you a bit.
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