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When a cell is conneted in a circuit, a ...

When a cell is conneted in a circuit, a current `1_(1)` flows in the circuit. When one more identical cell is conneted in series with the first one, a crrent `I_(2)` is found to flow in the circuit. When same cell is connected in parallel with the first one, the current is found to be `I_(3)`. Show that `3I_(2)I_(3)=2I_(1)(I_(2)+I_(3))`.

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