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PhysicsCurrent ElectricityEquivalent ResistanceEasy2 minPYQ_2016

PhysicsEasysingle choice

Two resistances at $0^{\circ} C$ with temperature coefficient of resistance $α_{1}$ and $α_{2}$ joined in series act as a single resistance in a circuit. The temperature coefficient of their single resistance will be

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Answer:

Solution:

$R_{1} = R_{0} (1 + α_{1} t) + R_{0} (1 + α_{2} t) = 2 R_{0} (1 + \frac{α _{1} + α _{2}}{2} t)$ Comparing with $R = R_{0} (1 + α t)$ $α = \frac{α _{1} + α _{2}}{2}$

Stream:BITSATSubject:PhysicsTopic:Current ElectricitySubtopic:Equivalent Resistance

⏱ 2mℹ️ Source: PYQ_2016

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