The temperature coefficient of resistance for a wire is 0.00125/0C. At 300 K its resistance is 1 ohm. The temperature at which the resistance becomes 2 ohm is

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1154 K

1100 K

1400 K

1127 K

answer is D.

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Detailed Solution

R1R2 = 1+αt11+αt2 ⇒ 12 = 1+0.00125 × 271+0.00125 ×t⇒ t=8540C ⇒T=1127K

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