A straight line plot showing the terminal potential energy (V) of a cell as a function of current ( I) drawn from it , is shown in the figure . Using this plot determine (i) the emf and (ii) internal resistance of the cell.

dear student,
equation of graph is 

V=-1.2-0.80.12-0.04i+1.4V=-5i+1.4
emf is when current is zero 
therefore emf is 1.4V
internal resistance is magnitude of slope hence 5ohm
regards
 

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