Q.

When the temperature  of a rod increases from t to t+Δt , its moment of inertia increases from I to I+ΔI . If    be the coefficient of linear expansion of the rod, then the value of  ΔII is

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a

2αΔt

b

αΔt

c

αΔt2

d

Δtα

answer is A.

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Detailed Solution

I∝R2ΔTI=2ΔRR=2αΔt
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