two cells of emf 10V and 15V are connected in parallel to each other between points A and B .the cell of emf 10V is ideal but the cell of emf 15 V has internal resistance 1ohm.The equivalenyt emf between A and B is
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Put the internal resistance r1=0 in the formula and find the answer
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It has to put the resistance r1=0 and formula could be evaluated based on the answer given.
In fact, maximum current drawn must be taken with the battery value and it denotes emf of the 10V and internal resistance could be measured accordingly.
This has been taken from secondary cells and 1.9 V could be measured in large internal resistance.
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