What is the value of the permeability of free space in SI units?

1. A Option A: 4π × 10⁻⁷ Wb A⁻¹ m⁻¹
2. B Option B: 4π × 10⁻⁹ Wb A⁻¹ m⁻¹
3. C Option C: 4π × 10⁻⁸ Wb A⁻¹ m⁻¹
4. D Option D: 4π × 10⁻¹⁰ Wb A⁻¹ m⁻¹

Answer checked 11 October 2026 · How we write and check questions