A cell of electromotive force (e.m.f.) $3.0V$ and internal resistance $0.50\Omega$ is connected to a variable resistor, a voltmeter and an ammeter, as shown. The resistance of the variable resistor is varied.
The reading on the ammeter $I$ and the reading on the voltmeter $V$ are recorded.
Which graph shows how $V$ varies with$I$?
1 )
2 )
4 )
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