Physics Electrostatics PMDC 2020
PMDC Verified Question 96 of 131
Q.109 The values of electric intensity will ____ due to the presence of dielectric medium:
A
Increase
B
Increase exponentially
C
Decrease
D
Remains same
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Decrease
1. Concept:

A dielectric material consists of atoms that polarize when placed in an electric field. This polarization establishes an internal opposing electric field, which acts to reduce the overall net electric intensity.

2. Formula:

$$ E_{medium} = \frac{E_{vacuum}}{\epsilon_r} $$

3. Solution:

  • Because the relative permittivity (\( \epsilon_r \)) of any real dielectric is strictly greater than 1, dividing the original vacuum field by \( \epsilon_r \) guarantees that the final field strength mathematically decreases.


4. Why other options are incorrect:

Increasing the field would violate conservation of energy and require the material to actively pump energy into the field, which passive insulators cannot do.

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