Physics Electrostatics PMDC 2020
PMDC Verified Question 95 of 131
Q.108 If the potential at a point which is 1m from a charge is 1volt, then the potential at a point which is 2m from the same charge will be:
A
2 V
B
1 V
C
0.5 V
D
3 V
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 0.5 V
1. Concept:

The electric potential produced by a point charge is inversely proportional to the linear distance away from it.

2. Formula:

$$ V \propto \frac{1}{r} $$

3. Solution:

  • The distance changes from 1m to 2m, meaning it has exactly doubled.


  • Because \( V \) relies on \( 1/r \), doubling the denominator divides the potential by exactly 2.


  • New potential: \( V' = 1 \text{ V} / 2 = 0.5 \text{ V} \).


4. Why other options are incorrect:

Option A incorrectly assumes a direct relationship (distance up -> potential up). Option B assumes potential is constant regardless of space.

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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