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Q.

If the resistance of a conductor is 5Ω at 500C, and 7Ω at 1000C, then the mean temperature coefficient of resistance of the material is

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a

0.008/0C

b

0.006/0C

c

0.004/0C

d

0.001/0C

answer is A.

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Detailed Solution

Using  RT2 =RT1 1+ αT2−T2⇒R100 =R50 1+α 100−50⇒ 7=5 1+α ×50 ⇒α = 7−5250 = 0.008/0C
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