DP Physics (last assessment 2024)
Question 19M.3.SL.TZ2.c
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.SL.TZ2.c |
| Level | SL | Paper | 3 | Time zone | TZ2 |
| Command term | Outline | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
19M.3.SL.TZ2.c
A student investigates the electromotive force (emf) ε and internal resistance r of a cell.
The current I and the terminal potential difference V are measured.
For this circuit V = ε - Ir .
The table shows the data collected by the student. The uncertainties for each measurement
are shown.
The graph shows the data plotted.
Outline, without calculation, how the internal resistance can be determined from this graph.
[2]
Markscheme
determine the gradient «of the line of best-fit» ✔
r is the negative of this gradient ✔
