Physics Electrostatics UHS 2023
PMDC Verified Question 34 of 131
Q.151 Gauss's law cannot be used to find which of the following quantity?
A
Electric field intensity
B
Electric flux density
C
Charge
D
Permittivity
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Permittivity
1. Concept:

Gauss's Law provides a spatial relationship equating the net electric flux leaving a closed volume to the total charge held inside it.

2. Formula:

$$ \oint \vec{E} \cdot d\vec{A} = \frac{Q_{enc}}{\epsilon_0} $$

3. Solution:

  • The law treats the permittivity constant (\( \epsilon_0 \)) as a fundamental prerequisite input, an established property of the universe/medium.


  • You manipulate the formula to solve for the field (\( E \)), the flux (\( EA \)), or the enclosed charge (\( Q \)). You cannot "find" permittivity via this macroscopic law.


4. Why other options are incorrect:

The other options are variables algebraically locked into the primary equation, making them all directly solvable if the other parameters are known.

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