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PhysicsCurrent ElectricityMicroscopicEasy2 minPYQ_2020

PhysicsEasysingle choice

Two wires $A$ and $B$ of the same material, having radii in the ratio 1: 2 and carry currents in the ratio 4: 1 . The ratio of drift speed of electrons in $A$ and $B$ is

Options:

Answer:

Solution:

Current flowing through the conductor, $I = nevA$ . Hence $\frac{4}{1} = \frac{nev _{d_{1}} π ( 1 ) ^{2}}{nev _{d_{2}} π ( 2 ) ^{2}}$ or $\frac{v _{d_{1}}}{v _{d_{2}}} = \frac{4 \times 1}{1} = \frac{16}{1}$

Stream:BITSATSubject:PhysicsTopic:Current ElectricitySubtopic:Microscopic

⏱ 2mℹ️ Source: PYQ_2020

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