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Find current through 4 ohm resistance

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Four resistances are connected in a circuit as shown in the following diagram.The value of the current in ampere in 4ohm and 6ohm resistance are :–

Electric Current|Ohm's Law|OMR

When a resistance of 2 ohm is placed across a battery the current is 1 A and when the resistance across the terminals is 17 ohm, the current is 0.25A. The emf of the battery is