A brass scale correctly calibrated at 15∘C is employed to measure a length at a temperature of 35∘. If the scale measures a reading of 75cm(αbrass=2×10−5/∘C)
A
74cm
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B
76cm
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C
78cm
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D
75.03cm
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Solution
The correct option is B74cm Given:Δt=10−30=−20oC,P1=75cm