The dimensional formula for permeability of free space, μ₀, is:

Question

G1 Physics · Accepted Answer

Step 1: From the Biot–Savart law, B∝μ₀ I dl/r². Step 2: Thus [μ₀]=[B][L]/[A]=[M L T⁻² A⁻²]. Final: Correct answer: A.