Question

The constant μ₀ is called the ______ of free space, and its exact value in SI units is:

Options

• permeability; \[8.85 \times 10^{-12}\ \text{N A}^{-2}\]

• permittivity; \[4\pi \times 10^{-7}\ \text{N A}^{-2}\]

• permeability; \[4\pi \times 10^{-7}\ \text{N A}^{-2}\]

• permeability; \[10^{-7}\ \text{N A}^{-2}\]

Answer 1

μ₀ is called the permeability of free space, with the exact fixed value μ₀ = 4π × 10⁻⁷ N A⁻² in SI units. It governs the strength of magnetic fields produced by currents in vacuum.