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PhysicsCurrent ElectricityEquivalent ResistanceEasy2 minPYQ_2020

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The ratio of the resistance of conductor at temperature $15^{o} C$ to its resistance at temperature ${37.5}^{o} C$ is $4 : 5$ . The temperature coefficient of resistance of the conductor is

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Answer:

Solution:

The resistance at temperature $t$ is

$R_{t} = R_{0} (1 + α t)$

$∴ \frac{4}{5} = \frac{1 + 15 α}{1 + 37.5 α}$

$\Rightarrow 4 (1 + 37.5 α) = 5 (1 + 15 α)$

$\Rightarrow 75 α = 1 \Rightarrow α = \frac{1}{75}^{o} C^{- 1}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Current ElectricitySubtopic:Equivalent Resistance

⏱ 2mℹ️ Source: PYQ_2020

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