Question

Give the SI unit of magnetic permeability of free space.

(a) T A m^-2

(b) T A^-2 m

(c) T A^-1 m

(d) T A m^2

I had been asked this question by my college professor while I was bunking the class.

The doubt is from Magnetic Field due to a Current Element & Biot-Savart Law topic in chapter Moving Charges and Magnetism of Physics – Class 12

Answer 1

Right answer is (c) T A^-1 m

To elaborate: Magnetic permeability of free space is a measure of the amount of resistance encountered when forming a magnetic field in a classical vacuum. The SI unit of permeability is weber ampere^-1 metre^-1 (Wb A^-1 m^-1) or tesla ampere^-1meter (T A^-1 m).