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 dA and dB (dA>dB) . If their moments of inertia about an axis passing through centres and normal to the circular faces be IA and IB , then
(a) IA = IB
(b) IA > IB
(c) IA < IB
(d) IA >=< IB
Ans. c
(6)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)