1.

From a given sample of uniform wire, two circular loops P and Q are made. P of radius 'r' and Q of radius nr. If the M.I. of Q about its axis is 4 times than that of P, then value of n is :

Answer»

`(4)^(1//3)`
`(4)^(2//3)`
`(4)^(1//4)`
`(4)^(1//2)`

Solution :Here `I_(Q)=4I_(P)`. Let m be the mass PER unit length of wire.
`THEREFORE mxx2pinr(nr)^(2)=4[(m2pir)r^(2)]`
IMPLIES `n^(3)=4impliesn=4^(1//3)`


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