Physics Current Electricity MDCAT 2013
PMDC Verified Question 102 of 112
12-volt battery is applied across 6\(\Omega\) resistance to have a steady flow of current. What must be the required potential difference across the same resistance to have a steady current of one ampere?
A
12V
B
1V
C
3V
D
6V
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 6V
Concept:

Ohm's Law relates voltage, current, and resistance.

Formula:

$$ V = IR $$

Solution:

  • We want a steady current \( I_{new} = 1 \text{ A} \).


  • The resistance remains unchanged, so \( R = 6 \, \Omega \).


  • The required potential difference \( V_{new} = I_{new} \times R = 1 \text{ A} \times 6 \, \Omega = 6 \text{ V} \).


Why other options are incorrect:

  • Opt A: 12V yields a current of 2A (\(12/6\)).


  • Opt B: 1V yields a current of 1/6 A.


  • Opt C: 3V yields a current of 0.5A.

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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