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Questions  

A meter rod made of steel is correct at 0°C and other meter rod of same material is correct at 30°C. If α = 12 × 10–6/°C, the difference between their lengths at 20°C is

a
0.024 cm
b
0.012 cm
c
0.036 cm
d
0.048 cm

detailed solution

Correct option is C

For first rod, For second rod,

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