Current Electricity: Ohm's Law at Atomic Scale MCQ

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Ohm's Law at Atomic ScaleHardQuestion 31690

Question

Ohm's law at the atomic level fails in:

A
Copper at room temperature
B
Very thin films (nanoscale)
Correct
C
Thick wires
D
Alloys

Correct answer

Very thin films (nanoscale)

Explanation

At nanoscale, the mean free path of electrons becomes comparable to dimensions, and quantum effects (ballistic transport, quantised conductance) take over — Ohm's law breaks down.

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