Physics Electrostatics MDCAT 2009
PMDC Verified Question 131 of 131
Q.78 The work done in moving a unit positive charge from one point to another point against the electric field is a measure of:
A
Capacitance
B
Potential difference between two points
C
Intensity of electric field
D
Resistance between two points
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Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Potential difference between two points
1. Concept:

The fundamental definition of electric potential difference relates it directly to the work done against an electric field to move a charge.

2. Formula:

$$ \Delta V = \frac{W}{q_0} $$

3. Solution:

  • By definition, when a unit positive charge (\( q_0 = +1 \text{ C} \)) is moved against an electric field, the work done (\( W \)) is exactly equal to the potential difference (\( \Delta V \)) between those two points.


4. Why other options are incorrect:

Capacitance relates to charge storage per unit voltage. Electric field intensity is force per unit charge. Resistance opposes the flow of current. Only potential difference is defined as work per unit charge.

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