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A student is asked to connect four cells...

A student is asked to connect four cells of emf of `1.5V` and internal resistance `0.25` `ohm` in series with an external resistance of `1` `ohm` but one cell is wrongly connected by him with its terminal reversed.Current in the circuit is

1) `0.5A`

2) `1A`

3) `1.5A`

4) `1.2A`

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