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Q.

The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is $0.4 Ω$ , what is the maximum current that can be drawn from the battery?

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a

40A

b

20A

c

10A

d

30A

answer is C.

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Detailed Solution

For maximum current it must be short circuited then R=0

$i_{\max} = \frac{E}{r} = \frac{12}{0.4} = 30 A$

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