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[" Two cells of equal e.m.f.and of inter...

[" Two cells of equal e.m.f.and of internal "],[" resistances "r_(1)" and "r_(2)(r_(1)>r_(2))" are "],[" connected in series.On connecting this "],[" combination to an external resistance "R" ,"],[" it is observed that the potential "],[" difference across the first cell becomes "],[" zero.The value of "R" will be "],[[" (A) "r_(2)(r_(1)>r_(2)),(r_(1)+r_(2))/(2)],[" (B) "r_(1)-r_(2),(r_(1)-r_(2))/(2)]]

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