In the circuit shown in figure a 12 V ba...

In the circuit shown in figure a `12 V` battery with unknown internal resistance `r` is connected to another battery with unknown emf E and internal resistance `1Omega ` and to a resistance of `3Omega` carrying a current of `2A`. The current through the rechargeable battery is `1 A` in the direction shown. Figure the unknown current `i` internal resistance r and the emf E.

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