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

A cell of emf E and internal resistance r supplies currents for the same time t through external resistances R_(1) = 100 Omega and R_(2) = 40 Omega separately. If the heat developed in both cases is the same, then the internal resistance of the cell is

A cell of emf E and internal resistance r supplies currents for the same time t through external resistances R_(1) = 100 Omega and R_(2) = 40 Omega separately. If the heat developed in both cases is the same, then the internal resistance of the cell is

A cell of emf E is connected across a resistance R. The potential difference between the terminals of the cell is found to be V. The internal resistance of the cell must be -

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