Question

A circular disc A of radius r is made from an iron plate of thickness t and another circular disc B of radius 4r is made from an iron plate of thickness t/4. The relation between the moments of inertia I_A and I_B is

(a) I_A >I_B

(b) I_A =I_B

(c) I_A <I_B

(d) depends on the actual values of t and r.

Answer 1

The correct answer is

(c) I_A <I_B