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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityEquivalent ResistanceEasy2 minPYQ_2015

PhysicsEasysingle choice

Two metal wires of identical dimensions are connected in series. If $v_{1}$ and $v_{2}$ are the conductivities of the metal wires respectively, the effective conductivity if the combination is:NEET 2015 (Phase 2)

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Answer:

Solution:

$R_{e c} = \frac{l}{σ_{1} A} + \frac{l}{σ_{1} A} = \frac{l_{e q}}{σ_{e q} A_{e q}}$
$\frac{2 l}{σ_{e q} A} = \frac{l}{A} (\frac{{σ_{1} + σ}_{2}}{σ_{1} σ_{2}})$
$σ_{e q} = \frac{2 σ_{1} σ_{2}}{σ_{1} +σ_{2}}$

Stream:NEETSubject:PhysicsTopic:Current ElectricitySubtopic:Equivalent Resistance

⏱ 2mℹ️ Source: PYQ_2015

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