Physics Electrostatics SZABMU 2024
PMDC Verified Question 6 of 131
Q.183 How many electrons are there in one Coulomb charge?
A
\( 6.25 \times 10^{15} \)
B
\( 6.25 \times 10^{16} \)
C
\( 6.25 \times 10^{17} \)
D
\( 6.25 \times 10^{18} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: \( 6.25 \times 10^{18} \)
1. Concept:

A Coulomb is a massive macro-scale unit of charge, defined by an aggregate sum of billions of fundamental elementary charges.

2. Formula:

$$ n = \frac{Q}{e} $$

3. Solution:

  • Given total charge \( Q = 1 \text{ C} \).


  • The charge of a single electron is \( e = 1.6 \times 10^{-19} \text{ C} \).


  • Divide them: \( n = \frac{1}{1.6 \times 10^{-19}} \).


  • Calculate: \( n = 0.625 \times 10^{19} \).


  • Standardize scientific notation: \( 6.25 \times 10^{18} \text{ electrons} \).


4. Why other options are incorrect:

The other options suffer from decimal placement errors (orders of magnitude). The value \( 6.25 \times 10^{18} \) is a universally memorized constant bridging microscopic particles to macroscopic current.

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