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A power supply of fixed emf E is connect...

A power supply of fixed emf E is connected to a variable resistor (resistance = R) and an ammeter of resistance `R_(A)`. The internal resistance of supply is r. The potential difference between the terminals of the power supply in closed circuits is denoted by V and current in circuit denoted by I. A graph is obtained between V and I by drawing varying amount of current from the supply. The correct `V - I` graph for the given situation is



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