Polar moment of inertia $$(I_p)$$ of a circular disc is to be determined by suspending it by a wire and noting the frequency of oscillations (f)

A

$$I_p \alpha \frac {1}{f^2}$$

B

$$I_p \alpha {f^2}$$

C

$$I_p \alpha {f}$$

D

$$I_p \alpha \frac {1}{f}$$