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15. A circular disc X of radius R is made from an iron plate of thickness t, and another disc Y of radius 4R is made from an iron plate of thickness

A circular disc X of radius R is made from an iron plate of thickness t, and another disc Y of radius 4R is made from an iron plate of thickness t/4 .  Then the relation between the moment of inertia IX and IY is

(a)  IY = 64IX

(b)  IY = 32IX                                     

(c)   IY = 16IX

(d)  IY = IX

Ans. a

(4)

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