1. Concept: This is the rigid, standardized textbook definition of absolute electric potential, creating a universal baseline for measurement.
2. Formula: $$ V = \frac{W_{\infty \to r}}{q_0} $$
3. Solution: - To define "absolute" potential, the starting location must have precisely zero potential, which only occurs at an infinite spatial distance (\( r = \infty \)).
- By long-standing physics convention, we normalize this work by standardizing it against a "unit positive test charge" (\( +1 \text{ C} \)).
4. Why other options are incorrect: Moving 'any amount' of charge defines raw Work, not normalized Potential. Using 'any position' defines Potential Difference (\( \Delta V \)), not absolute potential. Standard convention prohibits using a negative test charge.
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