Series Combination of Cells

Q. State the principal of Electric generator.

Q. Six lead-acid type of secondary cells each of EMF 3 V and internal resistance 0.30 $\Omega$ are joined in series in the same direction to provide a supply to a resistance of 10 $\Omega$. What is the potential drop across the external resistor?

1. 13.2 V
2. 15.2V
3. 17.2V
4. 19.2V

Q. A wire of length L and 3 identical cells of negligible internal resistances are connected in series. Due to this current, the temperature of the wire is raised by $\Delta T$ in time t. A number N of similar cells is now connected in series with a wire of the same material and cross-section but of length 2L. The temperature of wire is raised by same amount $\Delta T$ in the same time t. The value of N is

1. 4
2. 6
3. 8
4. 9

Q. Six secondary cells each of emf 3V and internal resistance 0.3Ω are joined in series with a 10Ω resistor. The potential drop across the external resistor is .

1. 16V
2. 17.2V
3. 18V
4. 15.2V

Q. Six secondary cells each of emf 3V and internal resistance 0.3Ω are joined in series with a 10Ω resistor. The potential drop across the external resistor is .

1. 16V
2. 17.2V
3. 18V
4. 15.2V

Q. With reference to the circuit as shown in figure, what is the potential drop across the 5 $\Omega$ resistor?

1. 1 V
2. 10 V
3. 5 V
4. None of these