Define the term magnetic permeability `(mu)` and write its unit.

Explanation

### Step-by-Step Solution:

1. **Definition of Magnetic Permeability**:
Magnetic permeability (denoted as \( \mu \)) is defined as the ratio of the magnetic induction \( B \) (the magnetic flux density) developed in a material to the strength of the magnetic field \( H \) (the magnetic field intensity) that produces it. Mathematically, this can be expressed as:
\[ \mu = \frac{B}{H} \]

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