question_answer

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 figure. The emf and the internet resistance of the cell are-

A) \[2V,0.5\Omega \]          

B)        \[2V,0.4\Omega \]

C) \[>2V,0.5\Omega \]       

D)        \[>2V,0.4\Omega \]

Correct Answer: B

Solution :

[b] \[\varepsilon =2V\] \[\frac{\varepsilon }{r}=5\] \[\frac{2}{r}=5\] \[r=\frac{2}{5}=0.4\Omega \]