A battery is made by joining \( \mathrm{m} \) rows of identical cells in parallel. Each row consists of \( \mathrm{n} \) cells joined in series. This battery sends a maximum current \( \mathrm{I} \) in a given external resistor. Now the cells are so arranged that instead of \( \mathrm{m} \) rows, \( \mathrm{n} \) rows are joined in parallel and each row consists of \( \mathrm{m} \) cells joined in series. Find the current through the same external resistor (Total number of cells which is equal to \( \mathrm{nm} \) is connected)
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