The diameter of a fly wheel is `R`. Its coefficient of linear expansion is `alpha`. If its temperature is increased by `deltaT` the percentage increase in its moment of inertia is

Options

A. `200 xx alpha xx DeltaT`
B. `100 xx alpha xx DeltaT`
C. `50 xx alpha xx DeltaT`
D. `150 xx alpha xx Delta T `

Answer

A

Explanation

`I prop l^(2)`
` (DeltaI)/I = 2xx (Deltal)/l = 2 prop Delta t `