A battery of emf E and internal resistance r is connected across a resistance R. Resistance R can be adjusted to any value greater than or equal to zero. A graph is plotted between the current (i) passing through the resistance and potential difference (V) across it. Select the correct alternative (s)
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(a, b, c)
Potential difference across resistance is equal to the potential difference across the terminals of the battery. So V = E - Ir.
This is an equation of a straight line. Comparing this with the given graph, we can see that 
and 
. Also
When external resistance 
.
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