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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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+21°C

+53°C

-21°C

-53°C

answer is D.

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Detailed Solution

$\frac{R_{100} - R_{0}}{R_{θ} - R_{0}} = \frac{100 - 0}{θ - 0} \Rightarrow \frac{7.74 - 6.74}{6.53 - 6.74} = \frac{100}{θ} \Rightarrow θ = - 21^{o} C$

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