Brass scale of a Barometer gives correct reading at 0∘C. Coefficient of linear expansion of brass is 18×10−6/∘C. If the barometer reads 76 cm at 20∘C ,the correct reading is (γHg=18×10−5/∘C):
A
76.426 cm
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B
75.7cm
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C
76.642 cm
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D
76.264 cm
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Solution
The correct option is C 75.7cm Let the correct reading be l0.