Question

For a cell, the graph between the potential difference (V) across the terminals of the cell and the current (I) drawn from the cell is shown in the figure. The emf and the internal resistance of the cell are

• A. $2V,0.5\Omega$
• B. $2V,0.4\Omega$
• C. $>2V,0.5\Omega$
• D. $>2V,0.4\Omega$

Answer 1

Answer: (B)

$2V,0.4\Omega$

we know that for cell $V=E-ir$

where $E$ is emf and $r$ is resistance.

according to graph $r$ is the slope of graph and $E$ is the y-intercept.

so $E=2V$ and $r=\frac{2}{5}=0.4\Omega$