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To verify Ohm's law, a student connects the voltmeter across the battery as, shown in the figure. The measured voltage is plotted as a function of the current, and the following graph is obtained; V Internal Resistance Ammeter R V 1000 mA 1.5 V V 0 I If V 0 is almost zero, identify the correct statement :

1. The value of the resistance R is 1.5 Ω
2. The emf of the battery is l.5 V and its internal resistance is 1.5 Ω
3. The emf of the battery is l.5 V and the value of R is 1.5 Ω
4. The potential difference across the battery is 1.5 V when it sends a current of 1000 mA

Correct answer: The emf of the battery is l.5 V and its internal resistance is 1.5 Ω

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