The resistance of a coil in a platinum resistance thermometer at 0∘C is 5 ohm and at 100∘C it is 5.75 ohm. Its resistance at an unknown temperature is 5.15 ohm. Then the unknown temperature will be :-
A
40∘C
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B
10∘C
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C
15∘C
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D
20∘C
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Solution
The correct option is D20∘C We know that R=R0(1+α.T) Thus, temperature coeff