Physics Electrostatics MDCAT 2018
PMDC Verified Question 105 of 131
Q.98 Force experienced per unit positive test charge at a point in an electric field is the definition of:
A
Electric potential energy
B
Electric field strength
C
Electric potential
D
Electric field
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Electric field strength
1. Concept:

While 'electric field' refers to the region of influence, its quantifiable vector magnitude at any specific point is formally defined by its 'strength' or 'intensity'.

2. Formula:

$$ \vec{E} = \frac{\vec{F}}{q_0} $$

3. Solution:

  • The equation states that if you place a small positive test charge \( q_0 \) in a field, the measured force \( F \) divided by \( q_0 \) yields the exact Electric Field Strength at that spatial point.


4. Why other options are incorrect:

Electric potential energy is work, not force. Electric potential is work per unit charge. 'Electric field' (Option D) is technically true loosely, but 'Electric field strength' is the precise terminology for the quantitative measurement.

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