A wire carrying a current of 125 A is bent into the form of a circle of radius 5 cm. Calculate the flux density at the centre of the coil.

Explanation

To solve the problem of calculating the flux density at the center of a circular coil formed by a wire carrying a current of 125 A, we will follow these steps:

### Step 1: Understand the formula for magnetic flux density
The magnetic flux density (B) at the center of a circular coil can be calculated using the formula:
\[ B = \frac{\mu_0 \cdot I}{2 \cdot R} \]
where:
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