Discussion
Potential difference between two points is the work done per unit charge in moving
Answer: A
Correct answer: a charge from one point to the other against the field
\[ V_{ab} = -\int_b^a \mathbf{E}\cdot d\mathbf{l}. \] The work is per unit charge, so the result is a property of the field and the two points rather than of the charge moved. Moving round a closed path returns zero, which is the same statement that makes the field conservative.
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