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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentEasy2 minPYQ_2022

PhysicsEasysingle choice

Let $A$ be the cross-sectional area and $ρ$ be the specific resistance of a potentiometer wire. If $I$ is the current passing through the wire, then the potential gradient along the length of the wire is

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Answer:

Solution:

Potential gradient $=$ Potential difference per unit length . So, $k = \frac{V}{L} = \frac{I R}{L} = \frac{I ( ρ L / A )}{L} = \frac{I ρ}{A}$

Stream:MHT_CETSubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: PYQ_2022

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