Final answer:
The suitable unit for the constant μ (permeability of free space) is b.newton/ampere² or weber/meter as they correlate with the fundamental physical units involving electromagnetism.
Step-by-step explanation:
The question is asking for the correct unit for the constant μ (mu), also known as the permeability of free space. Given that μo is exactly 4 × 10⁻⁷ T · m/A by definition (where T is tesla, m is meters, and A is amperes), and 1 T is equivalent to 1 N/(A · m), we can determine that a suitable unit for μ would reflect this relationship. Therefore, the correct unit for μ is b.newton/ampere² or weber/meter since these are units derived from the fundamental physical units relating to electromagnetism. In this context, ampere also becomes a key term as it is the base unit of electric current within the International System of Units (SI).