Physics Electrostatics UHS 2023
PMDC Verified Question 33 of 131
Q.150 A charged particle moves in a uniform electric field between two oppositely charged parallel metal plates. To calculate the force acting on the particle due to the electric field, which quantity is not required?
A
Particle charge
B
Particle speed
C
Plate separation
D
Potential difference between the plates
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Particle speed
1. Concept:

The electrostatic force exerted on a charged particle inside a uniform electric field depends exclusively on the field's geometric parameters and the particle's own charge.

2. Formula:

$$ F = q E = q \left(\frac{V}{d}\right) $$

3. Solution:

  • Looking at the combined formula, computing Force requires: Particle charge (\( q \)), Potential difference (\( V \)), and Plate separation (\( d \)).


  • The particle's dynamic speed is entirely absent from the equations of electrostatics.


4. Why other options are incorrect:

Options A, C, and D are explicit variables within the \( F = q(V/d) \) equation, rendering them absolutely necessary for calculation. Speed only matters for magnetic fields (\( F = qvB \)).

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