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     EduGorilla 
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    Two cells of the same emf E but different internal resistances r1 and r2 are connected in series to an external resistance R. The value of R, for which the potential difference across the first cell is zero, is given by

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    1. R = r1 - r2
    2. R = r1 + r2
    3. R = r1r2
    4. R = r1/r2
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