1. Tardigrade
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  4. The temperature coefficient of the resistance of a wire is 0.00125 per ° C . At 300 K its resistance is 1 Ω. The resistance of wire will be 2 Ω, at

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Q. The temperature coefficient of the resistance of a wire is $0.00125\, per ^{\circ} C$ . At $300\, K$ its resistance is $1\, \Omega$. The resistance of wire will be $2\, \Omega$, at

KCETKCET 2003Current Electricity

Solution:

None of the four options are correct.
through option is close to correct answer.
$R_{t}=R_{0}(1+\alpha t)$
$1=R_{0}(1+0.00125 \times 27)$ ...(i)
$2=R_{0}(1+0.00125 \times t)$ ...(ii)
From Eqs. (i) and (ii)
$t=848^{\circ} C =1127\, K$