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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityMicroscopicHard2 minPYQ_2019

PhysicsHardsingle choice

Assertion : If the length of the conductor is doubled, the drift velocity will become half of the original value (keeping potential difference unchanged). Reason : At constant potential difference, drift velocity is inversely proportional to the length of the conductor.

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Answer:

Solution:

Drift velocity of free electron is given by $v_{d} = \frac{e E}{m} τ$ Here, $E = \frac{V}{l}$ $∴ v_{d} = \frac{e V}{m l} τ$ or $v_{d} \propto \frac{1}{l} (\frac{e V}{m} τ$ is constant $)$

Stream:AIIMSSubject:PhysicsTopic:Current ElectricitySubtopic:Microscopic

⏱ 2mℹ️ Source: PYQ_2019

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