Physics Current Electricity MDCAT 2017
PMDC Verified Question 96 of 112
A carbon resistor is connected to a battery of 50 volt and 2 ampere current is passing through it. If voltage is increased to 75 volt, current will become:
A
3Amp
B
4.5Amp
C
1.5Amp
D
6Amp
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: 3Amp
Concept:

A carbon resistor obeys Ohm's Law, maintaining a constant resistance.

Formula:

$$ R = \frac{V_1}{I_1} = \frac{V_2}{I_2} $$

Solution:

  • First, find the resistance: \( R = \frac{50 \text{ V}}{2 \text{ A}} = 25 \, \Omega \).


  • Now, apply the new voltage to find the new current: \( I_2 = \frac{V_2}{R} \).


  • \( I_2 = \frac{75 \text{ V}}{25 \, \Omega} = 3 \text{ A} \).


Why other options are incorrect:

  • Opt B, C, D: Purely incorrect mathematical division, or incorrectly assuming an inverse relationship.

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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