Physics Electrostatics SZABMU 2023
PMDC Verified Question 37 of 131
Q.154 The relative permittivity of air (1 atm) is:
A
1
B
1.0006
C
22.25
D
2.284
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: 1.0006
1. Concept:

Relative permittivity (dielectric constant) compares a medium's resistance to forming an electric field against a perfect vacuum.

2. Formula:

$$ \epsilon_r = \frac{\epsilon_{medium}}{\epsilon_0} $$

3. Solution:

  • A perfect vacuum is exactly defined as \( \epsilon_r = 1.0000 \).


  • Standard dry air contains sparse gas molecules that polarize very slightly, raising its constant just barely above a vacuum to approximately \( 1.0006 \).


4. Why other options are incorrect:

Option A is the strict mathematical value for a pure vacuum. Options C and D represent denser liquid or solid dielectrics, not near-vacuum gases.

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