Physics

Physics

Problem

An external agent performs −4 J-4\,\text{J} of work while moving a +1 C+1\,\text{C} charge from point A to point B. Which statement is correct? a) Point B is 4 V4\,\text{V} higher in potential than point A b) The potential difference between A and B cannot be determined from the data provided c) Point A is 4 V4\,\text{V} higher in potential than point B d) Points A and B are at the same potential
Intuitive explanation

The key is understanding that work done by an external agent tells you about the electric potential difference between the points. When an external agent does negative work, it means the electric field itself is doing positive work—the charge naturally "wants" to move that way. Use the relationship Wext=qΔVW_{\text{ext}} = q \Delta V to find the potential change, then interpret what that tells you about the field direction and the charge's natural motion.

Intuitive explanation

The key is understanding that work done by an external agent tells you about the electric potential difference between the points. When an external agent does negative work, it means the electric field itself is doing positive work—the charge naturally "wants" to move that way. Use the relationship Wext=qΔVW_{\text{ext}} = q \Delta V to find the potential change, then interpret what that tells you about the field direction and the charge's natural motion.

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