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Q.

A platinum wire has a resistance of 2. 62Ω at 15°C and 3.29 Ω at 80°C. Find the temperature coefficient of the resistance of platinum wire.

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a

4.18×10−3∘C−1

b

9.34×10−3∘C−1

c

1.934×10−3∘C−1

d

934×10−3∘C−1

answer is A.

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a=R2−R1R1t2−R2t1
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