Physics Electrostatics ETEA 2014
PMDC Verified Question 123 of 131
Q.87 The potential difference between a pair of similar parallel conducting plates is known. What additional information is needed in order to find the electric field strength between the plates?
A
Separation of the plates
B
Separation and area of the plates
C
Permittivity of the medium separation of the plates
D
Permittivity of the medium separation and area of plates
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Separation of the plates
1. Concept:

For a uniform electric field generated between two parallel conducting plates, the field strength only depends on the voltage drop and the distance over which that drop occurs.

2. Formula:

$$ E = \frac{\Delta V}{d} $$

3. Solution:

  • Since \( \Delta V \) (potential difference) is already known, the only missing variable required to calculate \( E \) is \( d \), which represents the separation of the plates.


4. Why other options are incorrect:

Area and permittivity are needed to find the capacitance or the total charge, but they are absolutely unnecessary for finding the electric field strength if the potential difference is already known.

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