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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityMicroscopicEasy2 minPYQ_2020

PhysicsEasysingle choice

Two wires $A$ and $B$ of the same material, have 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:

Drift speed of electrons is given by

$I = n e A v_{d}$

Therefore $v_{d} \propto \frac{I}{r^{2}}$

$\frac{(v_{d})_{A}}{(v_{d})_{B}} = \frac{I_{A}}{I_{B}} \times \frac{r_{B}^{2}}{r_{A}^{2}}$

$\frac{(v_{d})_{A}}{(v_{d})_{B}} = \frac{4}{1} \times \frac{2^{2}}{1^{2}} = \frac{16}{1}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Current ElectricitySubtopic:Microscopic

⏱ 2mℹ️ Source: PYQ_2020

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