Q.
The resistance of a resistance thermometer has values 2.7Ω and 3.7Ω at 00C and 1000C respectively. The temperature at which the resistance is 3.1Ω is
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a
300C
b
400C
c
600C
d
700C
answer is B.
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Detailed Solution
Rt, R0, R100, are resistances of wire at t0C,00C,1000C then temperature is t=Rt−R0R100−R0×100 substitute the given values in above equation t=3.1−2.73.7−2.7×100 ⇒t=0.41×100 ⇒t=400C
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