For the circuit shown in the figure, the current \(I\) will be:

| 1. | \(0.75~\text{A}\) | 2. | \(1~\text{A}\) |
| 3. | \(1.5~\text{A}\) | 4. | \(0.5~\text{A}\) |
A battery consists of a variable number \(n\) of identical cells (having internal resistance \(r\) each) which are connected in series. The terminals of the battery are short-circuited and the current \(I\) is measured. Which of the graphs shows the correct relationship between \(I\) and \(n?\)
| 1. | 2. | ||
| 3. | 4. |
| 1. | \(20\) | 2. | \(30\) |
| 3. | \(40\) | 4. | \(10\) |