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Question

A battery has e.m.f. 4 V and internal resistance r. When this battery is connected to an internal resistance of 2 ohms, a current of 1 amp. flows in the circuit. How much current will flow if the terminals of the battery are connected directly :-

A
1 A
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B
2 A
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C
4 A
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D
infinite
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Solution

The correct option is C 2 A
Current in the circuit is I=Er+R=4r+2=1
or 2+r=4
or r=2Ω
When the terminals of battery are connected directly, the current =E/r=4/2=2A

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