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  4. For a cell, a graph is plotted between the potential difference V across the terminals of the cell and the curremt I drawn from the cell (see figure). The emf and the internal resistance of the cell are E and r, respectively. Then

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Q. For a cell, a graph is plotted between the potential difference $V$ across the terminals of the cell and the curremt $I$ drawn from the cell (see figure). The emf and the internal resistance of the cell are $E$ and $r$, respectively. ThenPhysics Question Image

Current Electricity

Solution:

$V=E-i r$. When $i=0$, the potential reading is $2\, V$.
Hence emf is $2\, V$. When $V=0, i=5\, A$.
This gives $r=0.4\, \Omega$.