In an electric circuit, the work done in moving a unit positive charge from one point to another is measured by the distance between those points

The work done in moving a unit positive charge from one point to another in an electric circuit is measured by the potential difference between those points (option B). Potential difference, also known as voltage, represents the energy per unit charge required to move the charge between two points in an electric field. This concept is critical in understanding how electric circuits operate, as it determines how much energy is available to drive current through the circuit. Unlike resistance, which measures the opposition to current flow, or current, which measures the flow rate of electric charge, potential difference specifically quantifies the energy aspect of the electric circuit. The strength of the electric current, on the other hand, describes the amount of charge passing a point in the circuit per unit time, not the energy required to move the charge. Therefore, potential difference is the correct term for measuring the work done per unit charge.