Q.
A metal rod has length of 1m at 20∘C. α of metal is 2×10−5/0C. The temperature at which its length will be decreased by 1mm is
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a
−10∘C
b
−20∘C
c
−30∘C
d
30∘C
answer is C.
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Detailed Solution
Δl=l1αΔt
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