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

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$4.18 \times {10^{- 3}}^{\circ} C^{- 1}$

$9.34 \times {10^{- 3}}^{\circ} C^{- 1}$

$1.934 \times {10^{- 3}}^{\circ} C^{- 1}$

$934 \times {10^{- 3}}^{\circ} C^{- 1}$

answer is A.

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Detailed Solution

$a = \frac{R_{2} - R_{1}}{R_{1} t_{2} - R_{2} t_{1}}$

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