Two cells with the same emf E and different internal resistances r1 and r2 are connected in series to an external resistance R. The value of R so that the potential difference across the first cell be zero, is
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Updated on : 2022-09-05
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Correct option is C)
The two cells have potential E each and respective internal resistance r1 and r2.
Let the current flowing in the circuit be i.
Using Kirchhoff's voltage law:
Potential across first cell, VAB=ir1−E=(R+r1+r2)2Er1−E