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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityMicroscopicEasy2 minPYQ_2018

PhysicsEasysingle choice

A current $i$ is flowing through the wire of diameter (d) having drift velocity of electrons $v_{d}$ in it. What will be new drift velocity when diameter of wire is made $d /4$ ?

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Answer:

Solution:

$∵$ Current, $I = nAev_{d}$ or $v_{d} \propto \frac{1}{A}$ If diameter of wire is $\frac{d}{4}$ , then area will be $\frac{A}{16}$ , so new drift velocity $= 16 v_{d}$ .

Stream:JIPMERSubject:PhysicsTopic:Current ElectricitySubtopic:Microscopic

⏱ 2mℹ️ Source: PYQ_2018

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