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Q.

A metre scale made of steel is calibrated at 20°C to give correct reading. Find the distance between 50 cm mark and 51 cm mark if the scale is used at 10°C. Coefficient of linear expansion of steel is 1.1 × 10–5/°C

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a

1.0011 cm

b

1.011 cm

c

1.000011 cm

d

1.00011 cm

answer is A.

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Detailed Solution

lc=lm1+αS−αbt2−t1

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A metre scale made of steel is calibrated at 20°C to give correct reading. Find the distance between 50 cm mark and 51 cm mark if the scale is used at 10°C. Coefficient of linear expansion of steel is 1.1 × 10–5/°C