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Example 3 12 cells each having the same emf values are connected in series and...

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Example 3 12 cells each having the same emf values are connected in series and are kept in a closed box Some of the olls are wrongly connected This battery is connected in series with an ammeter and two cells identical with the others The current is 3 A when the cells and the battery aid each other and it is 2 A when the cells and the battery oppose each other How many cells are wrongly connected

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