Published by:
CGP EDU Academic Team
Published on: September 12, 2026
A platinum resistance thermometer has a resistance of 50 Ω at 20 °C . When dipped in a liquid the resistance becomes76.8Ω. The temperature coefficient of resistance for platinum is α = 3.92 × × 10 -3 / °C . The temperature of the liquid is
Text Solution
Verified by ExpertsThe correct answer is:
C
$\frac{R_1}{R_2} = \frac{(1+\alpha t_1)}{(1+\alpha t_2)} \Rightarrow \frac{50}{76.8} = \frac{(1+3.92 \times 10^{-3} \times 20)}{(1+3.92 \times 10^{-3} t)}$
$\Rightarrow t = 167^\circ \mathrm{C}$
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