Consider a simple circuit shown in the figure. \(R'\) stands for variable resistance. \(R'\) can vary from \(R_0\) to infinity. \(r\) is the internal resistance of the battery \((r<<R<<R_0)\).
| (a) | Potential drop across \(AB\) is nearly constant as \(R'\) is varied. |
| (b) | Current through \(R'\) is nearly constant as \(R'\) is varied. |
| (c) | Current \(I\) depends sensitively on \(R'\). |
| (d) | \(I \geq { \dfrac V {r+R}}\) always. |
Which among the following statements is correct?
| 1. | (a, c) | 2. | (a, d) |
| 3. | (b, d) | 4. | (c, d) |
