So far we have used the constant µ0 everywhere. This means in each su

1.	So far we have used the constant µ0 everywhere. This means in each such case, we have carried out the evaluation in free space (vacuum). µ0 is the permeability of free space.
Answer» Permeability of free space or vacuum, µ₀ = 4π × 10^-7 H/m. Earlier SI (2006) had fixed this value of µ₀ as exact but revised SI fixes the value of e, requiring µ₀ (and ε₀ ) to be determined experimentally.

So far we have used the constant µ0 everywhere. This means in each such case, we have carried out the evaluation in free space (vacuum). µ0 is the permeability of free space.

Answer»

Permeability of free space or vacuum, µ₀ = 4π × 10^-7 H/m.

Earlier SI (2006) had fixed this value of µ₀ as exact but revised SI fixes the value of e, requiring µ₀ (and ε₀ ) to be determined experimentally.