Relative permeability of vacuum is

Explanation:

Relative Permeability of Vacuum

Definition: Relative permeability is a dimensionless quantity that represents the ratio of the permeability of a material to the permeability of free space (vacuum). It is denoted as μ_r and is mathematically expressed as:

μ_r = μ / μ₀

Here:

• μ: Permeability of the material.
• μ₀: Permeability of free space (vacuum), which is equal to 4π × 10^-7 H/m (Henry per meter).

The relative permeability of vacuum is a fundamental constant in electromagnetism and is always equal to 1. This is because the permeability of vacuum itself serves as the reference (or baseline) for all other materials.

Correct Option Analysis:

The correct option is:

Option 1: 1

The relative permeability of vacuum is 1 because:

• By definition, vacuum serves as the baseline for comparing the permeability of all other materials.
• Relative permeability is dimensionless, and for vacuum, the permeability (μ) is equal to the permeability of free space (μ₀), resulting in μ_r = μ / μ₀ = 1.

Therefore, option 1 is the correct answer