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Q.

In a resistance thermometer, the resistances at 0°C and 100°C are 6.74 ohm and 7.74 ohm respectively. The temperature corresponding to 6.53 ohm resistance is :

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a

+53°C

b

+21°C

c

-53°C

d

-21°C

answer is D.

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Detailed Solution

R100-R0Rθ-R0=100-0θ-0 ⇒            7.74-6.746.53-6.74=100θ ⇒             θ=-21oC
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