28. Two circular discs A and B are of equal masses and thickness but made of metals with densities

Two circular discs A and B are of equal masses and thickness but made of metals with densities d_A and d_B  (d_A>d_B) . If their moments of inertia about an axis passing through centres and normal to the circular faces be I_A   and  I_B , then

(a)   I_A  =   I_B

(b)   I_A  >  I_B

(c)   I_A <  I_B

(d)   I_A >=< I_B

Ans. c

(4)