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Q.

The resistance of a conductor is 5 ohm at 500C and 6 ohm at 1000C. Its resistance at 00C is

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a

1 ohm

b

2 ohm

c

3 ohm

d

4 ohm

answer is D.

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Detailed Solution

R1R2=1+αt11+αt2⇒ 56 = 1+α×501+α×100⇒α=1200 per 0CAgain  by Rt = R0 1+αt⇒ 5 = R0 1+1200 ×  50 ⇒ R0 =4 Ω
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The resistance of a conductor is 5 ohm at 500C and 6 ohm at 1000C. Its resistance at 00C is