Find (a) the magnetization `I`, (b) the magnetic intensity `H` and © the magnetic field `B` at the centre of a bar magnet having pole strength 3.6 A m, magnetic length `12cm` and cross-sectional are `0.90 cm^2`.

Explanation

To solve the problem step by step, we will find the magnetization \( I \), magnetic intensity \( H \), and magnetic field \( B \) at the center of the bar magnet.

### Given Data:
- Pole strength \( m = 3.6 \, \text{A m} \)
- Magnetic length \( L = 12 \, \text{cm} = 0.12 \, \text{m} \)
- Cross-sectional area \( A = 0.90 \, \text{cm}^2 = 0.90 \times 10^{-4} \, \text{m}^2 = 9.0 \times 10^{-5} \, \text{m}^2 \)

### Step 1: Calculate Magnetization \( I \)
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