Question

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 obtained:



If $V_0$ alomost zero, identify the correct statement :

• A. The emf of the battery is $1.5V$ and the value of $R$ is $1.5\Omega$
• B. The emf of the battery is $1.5V$ and its internal resistance is $1.5\Omega$
• C. The value of the resistance $R$ is $1.5\Omega$
• D. The potential difference across the battery is $1.5V$ when it sends acurrent of $1000mA$

Answer 1

The correct option is B The emf of the battery is $1.5V$ and its internal resistance is $1.5\Omega$

$V=E-IR$

When, $I=0,V=E=1.5V$

$1000\text{mA},V=0$

$\therefore 1.5-1\times r=0\Rightarrow r=1.5\Omega$

Hence, option (A) is the correct answer.