What is the temperature coefficient of resistance of material used in a resistor if the resistance at 25 °C is 50 Ω and at 70 °C is 57.2 Ω ?

1
\(\frac{1}{168.5}\)
2
\(\frac{1}{378.5}\)
3
\(\frac{1}{463.5}\)
4
\(\frac{1}{287.5}\)

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