For a cell, a graph is plotted between the potential difference V across the terminals of the cell and the current I drawn the cell. The emf and the internal resistance of the cell are E and r, respectively. Then

Options

A. `2 V, 0.5 Omega`
B. `2 V, 0.4 Omega`
C. `gt 2 V, 0.5 Omega`
D. `gt 2 V, 0.4 Omega`

Answer

B

Explanation

`P.d` across call `V = E - Ir`
When `I = 0, V = E = 2 V`
When `V = 0, 0 = E - 5 r rArr 0 = 2 - 5 r`
`r = 0.4 Omega`.