Please explain the following 20th question with reason.

Dear Student,
The terminal voltage (V) across the electrodes of a cell and its emf (E) are related by the relation:
V=E-Irwhere,I is the current through itr is the internal resistance of the circuit.Comparing it with the straight line equation:y=mx+cSlope = -rintercept = E

Ans (a)

Regards

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