DP Physics (last assessment 2024)
Question 17N.3.SL.TZ0.2
| Date | November 2017 | Marks available | [Maximum mark: 3] | Reference code | 17N.3.SL.TZ0.2 |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Show that, State | Question number | 2 | Adapted from | N/A |
2.
[Maximum mark: 3]
17N.3.SL.TZ0.2
An electrical circuit is used during an experiment to measure the current I in a variable resistor of resistance R. The emf of the cell is e and the cell has an internal resistance r.
A graph shows the variation of with R.
(a)
Show that the gradient of the graph is equal to .
[2]
Markscheme
«ε = IR + Ir»
identifies equation with y = mx + c
«hence m = »
No mark for stating data booklet equation
Do not accept working where r is ignored or ε = IR is used
OWTTE
(b)
State the value of the intercept on the R axis.
[1]
Markscheme
«–» r
Allow answer in words
