The variation of terminal potential difference (V) with current flowing through a cell is as shown. The emf and internal resistance of the cell are

Options

A. `6 V, 2Omega`
B. `3 V, 2 Omega`
C. `6 V, 0.5Omega`
D. `3 V, 0.5 Omega`

Answer

D

Explanation

(d): The equation of terminal potential difference of a cell is given by, V = E – Ir When I = 0, V = 3 V,
`:.` E = V = 3 V
When V = 0, I = 6 A `rArr` r = `E/I = 3/6 = 0.5 Omega`