Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityEquivalent ResistanceEasy2 minPYQ_2021

PhysicsEasysingle choice

Two metal wires of identical dimensions are connected in series. If $σ_{1}$ and $σ_{2}$ are the electrical conductivities of the metal wires respectively, the effective conductivity of the combination is

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Answer:

Solution:

$R_{e q} = R_{1} + R_{2}$ $\frac{1}{σ _{e q}} \frac{2 l}{A} = \frac{1}{σ _{1}} \frac{1}{A} + \frac{1}{σ _{2}} \frac{1}{A} [σ_{e q} = \frac{2 σ _{1} σ _{2}}{σ _{1} + σ _{2}}]$

Stream:WBJEESubject:PhysicsTopic:Current ElectricitySubtopic:Equivalent Resistance

⏱ 2mℹ️ Source: PYQ_2021

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