. The value of μ is
value of μ is 4π ×10 -7Hm-1.
The physical constant μ0 is known as vacuum permeability, free space permeability.
μ0 has an exact defined value in the classical vacuum reference medium.
The value of rks was set so that the ampere in the emu system is the same size as the mks unit of current:
Thus, μ0 is equal to 4π ×10 -7Hm-1.
Hence, option A is correct, i.e., True.