Physics Current Electricity ETEA 2022
PMDC Verified Question 63 of 112
When two conductors each of resistance R are attached in series to external circuit, their net resistance is:
A
R
B
2R
C
3R
D
4R
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: 2R
Concept:

For resistors connected in series, the total equivalent resistance is simply the algebraic sum of the individual resistances.

Formula:

$$ R_{eq} = R_1 + R_2 + \dots $$

Solution:

  • We have two identical conductors, so \( R_1 = R \) and \( R_2 = R \).


  • \( R_{eq} = R + R = 2R \).


Why other options are incorrect:

  • Opt A: This would be the resistance of just one conductor.


  • Opt C & D: These would apply if 3 or 4 resistors were in series, respectively.

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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