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0 A cell of unknown emfe and internal resistance r two unknown resistances R and...

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0 A cell of unknown emfe and internal resistance r two unknown resistances R and R R R and a perfect ammeter are given The current in the circuit is measured in five different situations a Without any external resistance in the circuit b With resistance R only c With resistance R only d With both R and R used in series combination e With both R and R2 used in parallel combination The current obtained in the five cases are 0 42 A 0 6 A 1 05 A 1 4 A and 4 2 A but not necessarily in that order Identify the currents in the five cases listed above and calculate r R and R

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