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1. A primary cell has emf \(2\ volt\). When short-circuited it gives a current of \(4\ amp\). Its internal resistance in ohm will be
2. To get maximum current through a resistance of \(2.5\ \Omega\), one can use \(m\) rows of cells, each row having \(n\) cells. The internal resistance of each cell is \(0.5\ \Omega\). What are the values of \(n\) and \(m\) if the total number of cells is \(45\)?
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