Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are `R_1 and R_2(R_1gtR_1).` if the potential difference across the source having internal resistance `R_2` is zero, then

Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are R_(1) and R_(2) (R_(1) gt R_(1)) . If the potential difference across the source having internal resistance R_(2) is zero, then

Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are R_(1) and R_(2) (R_(1) gt R_(1)) . If the potential difference across the source having internal resistance R_(2) is zero, then

Two cells, having the same emf, are connected in series through an external resistance R . Cells have internal resistance r_(1) and r_(2) (r_(1) gt r_(2)) respectively. When the circuit is closed, the potential difference across the first cell is zero the value of R is

Two cells, having the same emf, are connected in series through an external resistance R. Cells have internal resistance r_(1) and r_(2) (r_(1) gt r_(2)) respectively. When the circuit is closed, the potentail difference across the first cell is zero the value of R shown in the figure

Internal resistance of battery of emf 2E is R_1 and battery of emf E is R_2 . If the potential difference across the cell of emf 2E is zero, then value of R is