Tow cells with the same emf E and different internal resistances `r_(1)` and `r_(2)` are connected in series to an external resistances R . The value of R so that the potential difference across the first cell be zero is

Two cell with the same e.m.f. E and difference internal resistance r_(1) and r_(2) are connected in series to an external resistance R a value of R be selected such that the potential difference as the flow cell E should be zero when

Two cells of the same e.mf. e but different internal resistances r_(1) and r_(2) are connected in series with an external resistance 'R'. The potential drop across the first cell is found to be zero. The external resistance Ris

Two cells of emf 2E and E with internal resistance r_(1) and r_(2) respectively are connected in series to an external resistor R (see figure). The value of R, at which the potential difference across the terminals of the first cell becomes zero is

[" 27.Two cells of same emf "E" but of different internal resistance "r_(1)&r_(2)" are connected "],[" in series with an external resistance "R" .The potential drop across the first cell is "],[" found to be zero.The external resistance "R" is "]

A circuit consists of two cells, each of e.m.f. E and internal resistances r_(1) and r_(2) are connected in series through an external resistance X. If the potential difference between the ends of the first cell is zero, the value of X in terms of r_(1) and r_(2) will be

Two cells each of emf E and internal resistacne r_(1)" and "r_(2) respectively are conneted in series with an external resistance R. The potential defference between the terminats of the first cell will be zero when R equal to