Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityMicroscopicEasy2 minPDF

PhysicsEasymultiple choice

If the current in resistance of uniform cross section is doubled then, (assume temperature to be approximately constant).

Answer:

A, C, D

Solution:

$J = \frac{I}{A}$

Doubling I at fixed area doubles J.

$J = n e v_{d}$

At constant temperature, n and relaxation time stay constant, so drift speed doubles.

Hence A, C and D.

Stream:JEESubject:PhysicsTopic:Current ElectricitySubtopic:Microscopic

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