The diameter of a metal ring is D and coefficient of linear expansion is α . If the temperature of the ring is increases by 1°C , the circumference of the ring will increases by
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a
πDα2
b
2πDα
c
πDα
d
πD2α
answer is C.
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Detailed Solution
Change of circumference = original circumference x αΔt=2πR×α×1=2πD2×α=πDα