Physics Current Electricity SZABMU 2023
PMDC Verified Question 31 of 112
When length of copper wire is double then resistivity becomes:
A
Double
B
Half
C
Remains same
D
Four times
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Remains same
Concept:

Resistivity (\(\rho\)) is an intrinsic, material-specific property (like density) and does not scale with macroscopic dimensions.

Solution:

  • While doubling the length will double the wire's resistance (\(R\)), the resistivity of copper is a constant value at a given temperature.


  • Therefore, it remains the same regardless of how you cut or stretch the physical wire.


Why other options are incorrect:

  • Opt A, B, D: Confuses resistivity with resistance.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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