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Two cells of emf 4.5 V and 6.0 V and int...

Two cells of emf 4.5 V and 6.0 V and internal resistance `6 Omega` and `3 Omega` respectively have their negative terminals joined by a wire of `18 Omega` and positve terminals by a wire of `12 Omega` resistance. A third resistance wire of `24 Omega` connects middle points of these wires. Using Kirchhoff's find the potential difference at the ends of this third wire.

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