A triangular platge of uniform thickness and densilty ismade to rotate about an axis perpendicular to the plane of the paper an a. passing through `A` b. passing through `B`, by the application of some foce `F` at `C` (mid point of `AB`) as show in figure. In which case is angular acceleration more?

Options

A. angular acceleration in both the cases is the same
B. angular acceleration for case (a) is larger
C. angular acceleration for case (b) is larger
D. there would be no angular acceleration for case (a)

Answer

C

Explanation

`tau=Fd tau` is same in magnitude for both cases.
Also` tau=Ialpha`
so `Ialpha` is constant.
For case `b` I is small.
so `alpha` is large