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Q.

A steel tape is placed around the earth at the equator. When the temperature is 0°C neglecting the expansion of the earth, the clearance between the tape and the ground if the temperature of the tape rises to 30°C, is nearly αstteel =11×10−6/K

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a

1.1 km

b

0.5 km

c

6400 km

d

2.1 km

answer is D.

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Detailed Solution

Increase in length of tape; Δl=lαΔT
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A steel tape is placed around the earth at the equator. When the temperature is 0°C neglecting the expansion of the earth, the clearance between the tape and the ground if the temperature of the tape rises to 30°C, is nearly αstteel =11×10−6/K