Physics Current Electricity MDCAT 2011
PMDC Verified Question 105 of 112
If 2 A current passes through a resistor when connected to a certain battery. If the resistance is replaced by the double resistance, then the current will become
A
2A
B
6A
C
4A
D
1A
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 1A
Concept:

According to Ohm's Law, current is inversely proportional to resistance when voltage is constant.

Formula:

$$ I = \frac{V}{R} $$

Solution:

  • Initial current \( I_1 = 2\text{A} \).


  • The battery remains the same, so \( V \) is constant. \( I \propto \frac{1}{R} \).


  • If new resistance \( R' = 2R \), then new current \( I' = \frac{V}{2R} = \frac{I_1}{2} \).


  • \( I' = \frac{2}{2} = 1\text{A} \).


Why other options are incorrect:

  • Opt A: Current would only stay 2A if resistance didn't change.


  • Opt B & C: Current would increase only if resistance was decreased (e.g., to half). Doubling resistance restricts the flow more.

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.

Previous Question All Current Electricity MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App