Physics Electrostatics UHS 2022
PMDC Verified Question 66 of 131
Q.126 A charged particle is moving in a uniform electric field. For the motion of the particle due to the field, which quantity has a constant non-zero value?
A
Acceleration
B
Displacement
C
Rate of change of acceleration
D
Velocity
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Acceleration
1. Concept:

A uniform electric field provides an unchanging, constant electrostatic force on a charged particle at all points in space.

2. Formula:

$$ \vec{F} = q \vec{E} \implies \vec{a} = \frac{q \vec{E}}{m} $$

3. Solution:

  • Because both charge (\( q \)) and field strength (\( E \)) are constant, the resulting force (\( F \)) is totally constant.


  • By Newton's Second Law, a constant net force results in a constant, unchanging acceleration vector.


4. Why other options are incorrect:

Because the particle is accelerating, its velocity is continuously changing (ruling out D). Displacement is also rapidly changing as it moves (ruling out B). The rate of change of acceleration (jerk) is precisely zero, not non-zero (ruling out C).

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