Potential difference is defined as work done per unit_________.
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Solution
Electric potential is defined as the amount of work done to move a unit of positive charge from infinity to that point.
The electric potential at a point is equal to the work done by external force in bringing the unit positive charge from infinity to a point inside the electric field without changing the kinetic energy.
Unit of potential difference is volt(V).
Hence, Potential difference is defined as work done per unit charge.