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Q.

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 passing through the resistance (I) and potential difference (V) across it. Select the correct alternatives.
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a

Emf of the battery is 10V.

b

Internal resistance of the battery is  5Ω. 

c

V – I graph can never be a straight lines as shown in figure.

d

Maximum current that can be taken from the battery is 2A.

answer is A, B, C.

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Detailed Solution

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When I = 0 V = 10V   E = 10 V
V = 0 I = 2A  E-ir = 0 E = ir

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