Kelvi

The resistance of platinum wire at 0°C is $2\Omega$ and $6.8\Omega$ at 80°C. The temperature coefficient of resistance of the wire is:

medium

Current Electricity

2023

physics

$3 \times 10^{-4} °C^{-1}$

$3 \times 10^{-3} °C^{-1}$

$3 \times 10^{-2} °C^{-1}$

$3 \times 10^{-1} °C^{-1}$

Explanation

To solve this problem, we need to find the temperature coefficient of resistance, denoted as $\alpha. \\$ The formula for resistance as a function of temperature is: $\\ R_T = R_0 (1 + \alpha \Delta T) \\$

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The resistance of platinum wire at 0°C is 2Ω 2\Omega 2Ω and 6.8Ω 6.8\Omega 6.8Ω at 80°C. The temperature coefficient of resistance of the wire is:

Explanation

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The resistance of platinum wire at 0°C is $2\Omega$ and $6.8\Omega$ at 80°C. The temperature coefficient of resistance of the wire is: