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CGP EDU Academic Team
Published on: September 12, 2026
The temperature coefficient of resistance for a wire is 0.000125° C . At 300K its resistance is 1 ohm. The temperature at which the resistance becomes 2 ohm is
Text Solution
Verified by ExpertsThe correct answer is:
D
$\frac{\rho_1}{\rho_2} = \frac{(1+\alpha t_1)}{(1+\alpha t_2)} \Rightarrow \frac{1}{2} = \frac{(1+0.00125 \times 27)}{(1+0.00125 \times t)}$
$\Rightarrow t = 854^\circ \mathrm{C} \Rightarrow T = 1127 \mathrm{K}$
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