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Two metal rods have coefficients of linear expansion 1.1 × 10-5 /°C and 1.65 × 10-5 /°C respectively. The difference in lengths is 10cm at all temperatures. Their initial lengths must be respectively.

a
40 cm and 50 cm
b
40 cm and 30 cm
c
50 cm and 60 cm
d
30 cm and 20 cm

detailed solution

Correct option is D

l1α1=l2α2, l1−l2=10

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