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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.

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Internal resistors of battery is 10 $Ω$

Maximum current which can be taken from the battery is 4A

Internal resistance of battery is 5 $Ω$

Emf of the battery is 20V

answer is A.

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Detailed Solution

Equation of straight line

$V = 10 - i 5$

Comparing with

$V = E - \dot{ir}$

we get

E = 10V and Internal resistance = $5 Ω$

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