Physics Electrostatics ETEA 2018
PMDC Verified Question 109 of 131
Q.102 There are two charges \( +3\mu\text{C} \) and \( +8\mu\text{C} \) the ratio of the force acting on them will be:
A
3:1
B
1:1
C
11:8
D
3:8
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: 1:1
1. Concept:

By Newton's Third Law, electrostatic force is a mutual interaction. The force one charge exerts on the second is exactly equal in magnitude and opposite in direction to the force the second exerts on the first.

2. Formula:

$$ F_{1 \to 2} = F_{2 \to 1} = \frac{k q_1 q_2}{r^2} $$

3. Solution:

  • Charge 1 exerts a force \( F \) on Charge 2.


  • Charge 2 exerts an identical magnitude force \( F \) back on Charge 1.


  • The ratio \( F : F \) perfectly simplifies to 1:1.


4. Why other options are incorrect:

Options A and D bait students into thinking the force is somehow proportional only to the individual charge experiencing it, rather than the product of both charges.

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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