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Four cells of identical emf and internal resistance are connected in series to a variable...

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Four cells of identical emf and internal resistance are connected in series to a variable resistor The following graph shows the variation of terminal voltage of the combination with current output V in volt 5 6 4 2 2 8 1 4 0 5 1 0 1 5 2 0 in amp a What is emf of each cell b Calculate internal resistance of each cell c For what current from the cells does maximum power dissipation

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