Question

23. A wire has resistance of 3.1 2 at 30°C and 4.5 2 at 100°C. The temperature coefficient of
resistance to the wire is approximately
(1) 12 x 10-4 °C-1
(2) 24 x 10-4 °C
(3) 32 x 10-4 °C-1
(4) 7 x 10-3 °C-1
Hint: Use R = R, [1 + a(AT)​

Answer 1

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