A cell develops the same power across two resistances `R_(1)` and `R_(2)` separately. The internal resistance of the cell is

A cell develops the same power across two resistance R_(1) and R_(2) separately. The internal resistance of the cell is

A cell of e.m.f E is connected to a resistance R_(1) for time t and the amount of heat generated in it is H. If the resistance R_(1) is replaced by another resistance R_(2) and is connected to the cell for the same time t, the amount of heat generated in R_(2) is 4H. Then the internal resistance of the cell is

A cell of e.m.f E is connected to a resistance R_(1) for time t and the amount of heat generated in it is H. If the resistance R_(1) is replaced by another resistance R_(2) and is connected to the cell for the same time t, the amount of heat generated in R_(2) is 4H. Then the internal resistance of the cell is

A cell supplies a current i_(1) trhough a resistnace R_(1) and a current i_(2) through a resistance R_(2) . The internal resistance of this cell is

A cell of constant emf first connected to a resistance R_(1) and then connected to resistance R_(2) . If power deliverd in both cases is same, then the internal resistance of the cell is

A cell of constant e.m.f. first connected to a resistance R_(1) and then connected to a resistance R_(2) . If power delivered in both cases is then the internal resistance o f the cell is

Two cells of emf 3V and 5V and internal resistance r_(1) and r_(2) respectively are in series with an external resistance R. if the p.d. across 1 st cell is zero, then R is