The dimensions of ( μ0 ∊0 )

1. [L^{1 / 2} T^{– 1 / 2}]
2. [L^{– 1} T]
3. [L T^{– 1}]
4. [L^{– 1 / 2} T^{1 / 2}]

(μ₀ε₀)^{-1 / 2} =	1	= c : speed of light
	√μ₀ε₀

where ε₀ = permittivity of free space
μ₀ = permeability of free space
So dimensions are [LT^{– 1}]