The core of a toroid having 3000 turns has inner and outer radii of 16 cm and 17 cm respectively . The magnetic field in the core for a current of `0.07` A is 2.5 T . What is relative permeability of the core ?

Explanation

To find the relative permeability of the core of the toroid, we can follow these steps:

### Step 1: Identify the given values
- Number of turns (N) = 3000
- Inner radius (r1) = 16 cm = 0.16 m
- Outer radius (r2) = 17 cm = 0.17 m
- Magnetic field (B) = 2.5 T
- Current (I) = 0.07 A
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