Question

A charge is moved from point A to a point B. The work done to move unit charge during this process is called \dots

• A. potential at A
• B. potential at B
• C. potential difference between A and B
• D. current from A to B

Hint:

Potential at one point refers to energy relative to infinity, while potential difference compares energy between two points.

Answer 1

The Correct Option is C

Concept: Electric potential difference between two points is defined as the work done in moving a unit positive charge from one point to another in an electric field.

Step 1: Recall the formula for potential difference. \[ V = \frac{W}{q} \] where:
• $V$ = potential difference
• $W$ = work done
• $q$ = charge moved

Step 2: Understand the meaning of unit charge. The question specifically mentions work done to move unit charge from point A to point B. This exactly matches the definition of electric potential difference.

Step 3: Identify the correct term. Therefore, the quantity described is: \[ \boxed{\text{Potential difference between A and B}} \] Hence, the correct option is (3).