When a wheel with metal spokes 1.2m long is rotated in a magnetic field of flux density `5 xx 10^(-5)T` normal to the plane of the wheel, an e.m.f. of `10^(-2)` volt is induced between the rim and the axle. Find the rate of rotation of the wheel.

Explanation

To solve the problem step by step, we will use the formula for the induced electromotive force (e.m.f.) in a rotating system and the relationship between angular frequency and frequency.

### Step-by-Step Solution:

1. **Identify Given Values**:
- Length of spokes (l) = 1.2 m
- Magnetic flux density (B) = \(5 \times 10^{-5} \, T\)
- Induced e.m.f. (E) = \(10^{-2} \, V\)
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