Physics Current Electricity UHS 2023
PMDC Verified Question 26 of 112
The resistance of the wire varies inversely as:
A
Area of cross section
B
Length
C
Resistivity
D
Temperature
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Area of cross section
Concept:

Resistance is dictated by the physical geometry of the conductor.

Formula:

$$ R = \rho \frac{L}{A} $$

Solution:

  • The formula places Cross-sectional Area (\( A \)) in the denominator.


  • This implies that as Area increases, Resistance decreases. Thus, resistance varies inversely as the Area of cross section.


Why other options are incorrect:

  • Opt B & C: Resistance varies directly with Length and Resistivity (they are in the numerator).


  • Opt D: Resistance varies directly (linearly) with temperature for metals.

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