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Q.

A hole is drilled in a copper sheet. The diameter of the hole is 4.24 cm at 27.0°C . What is the change in the diameter of the hole when the sheet is heated to 227°C ? α for copper =1.70×10−5K−1

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a

1.44 × 10-2 cm

b

14.4 × 10-2 cm

c

144 × 10-2 cm

d

0.144 × 10-2 cm

answer is A.

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L2−L1=L1aΔT
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