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The ends of a resistance are connected t...

The ends of a resistance are connected to 19 cells in series, each of resistance `0.1 Omega`. The current is found to be 2 A. The number of cells is reduced to 15 and an extra resistance of `9.5 Omega` is connected in series to the given resistance. The current becomes one-half. Find the given resistance and emf of each cell.

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