If I is moment of inertia of a disc about an axis passing through its centre then find change in moment of inertia due to small change in its temperature `Deltat` (`alpha` is coefficient of linear expansion).

Explanation

To solve the problem of finding the change in moment of inertia (ΔI) of a disc due to a small change in temperature (Δt), we can follow these steps:

### Step 1: Understand the Moment of Inertia
The moment of inertia (I) of a disc about an axis passing through its center is given by the formula:
\[ I = \frac{1}{2} m r^2 \]
where \(m\) is the mass of the disc and \(r\) is its radius.
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