DP Physics (last assessment 2024)
Question 22M.2.HL.TZ2.4b.ii
| Date | May 2022 | Marks available | [Maximum mark: 2] | Reference code | 22M.2.HL.TZ2.4b.ii |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Deduce | Question number | b.ii | Adapted from | N/A |
b.ii.
[Maximum mark: 2]
22M.2.HL.TZ2.4b.ii
A cell is connected to an ideal voltmeter, a switch S and a resistor R. The resistance of R is 4.0 Ω.
When S is open the reading on the voltmeter is 12 V. When S is closed the voltmeter reads 8.0 V.
(b.ii)
Deduce the internal resistance of the cell.
[2]
Markscheme
I = 2.0 A OR 12 = I (r + 4) OR 4 = Ir OR 8 = 4I ✓
«Correct working to get » r = 2.0 «Ω» ✓
Allow any valid method.
Allow ECF from (b)(i)
