Potential difference across a cell and current through a cell is shown in graph. A battery consists of such identical $40$ cells. Max current supplied by the battery through a load of $2.5\,\Omega $ equal to .............. $A$
A$20$
B$12$
C$4$
D$15$
Medium
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C$4$
c $\varepsilon=2$ $\mathrm{volt},$ $\mathrm{r}=1 \,\Omega$
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