A resistance of 4 Ω Ω and a wire of length 5 metres and resistance 5 Ω Ω are joined in series and connected to a cell of e.m.f. 10 V and internal resistance 1 Ω Ω . A parallel combination of two identical cells is balanced across 300 cm of the wire. The e.m.f. E of each cell is
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B
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