[MLQ⁻²]
[LTQ⁻¹]
[LT⁻¹Q⁻¹]
[ML²T⁻¹Q⁻²]
Correct option is A. [MLQ⁻²]
Force acting per unit length of each of two parallel wires carrying currents in the same direction placed certain distance apart in vacuum is
F/l = µ₀/(4π) * 2I₁I₂/r
MLT⁻²/L = µ₀(Q/T)²/L
Therefore, the dimensions of µ₀ are [MLQ⁻²]