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Questions  

By what temperature a rod should be heated so that its length becomes 2lo if its initial length is l0. Coefficient of linear expansion is α in that temperature range

a
ln 2α
b
α ln 2
c
ln 4
d
ln2

detailed solution

Correct option is A

dll dθ=α ⇒∫0△θ1.dθ = 1α∫l02l01ldl  ⇒△θ=ln 2α

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