Choose the wrong statement:

Potential difference across the terminals of the cell in a closed circuit is 

$ V = E - Ir $ when cell is being discharged 

Terminal potential difference versus current graph for a cell is a straight line with a negative slope.

$ V = E + Ir $ when cell is being charged 

In the presence of electrolyte, internal resistance, Ri is inversely proportional to temperature T. It is because, as we increase the temperature, more electrolyte dissociates and resistance decreases.