The graph shows how temperature varies with distance along a well-insulated metal rod which is conducting thermal energy at a steady rate. The slope of this graph is the temperature gradient. There is an analogy between electrical conduction and thermal energy conduction. If an equivalent electrical-graph were to be drawn, which electrical quantity,when plotted against distance along the rod, would have the slope shown. ?

Answer

B

Explanation

Electrical quantity anlogous to the temperature is electric potentialand the slope is rate of variation of potential with length which is potential gradient.