DP Physics (last assessment 2024)
Question 22N.2.HL.TZ0.b.iii
| Date | November 2022 | Marks available | [Maximum mark: 2] | Reference code | 22N.2.HL.TZ0.b.iii |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Calculate | Question number | b.iii | Adapted from | N/A |
b.iii.
[Maximum mark: 2]
22N.2.HL.TZ0.b.iii
Resistor R is connected in a circuit with a cell that has internal resistance.
The ammeter and the voltmeter are ideal.
The resistance of R is 50.0 Ω. The voltmeter reads 1.47 V.
Resistor R is replaced by another of resistance 10.0 Ω. The ammeter now reads 139 mA.
Calculate the emf of the cell.
[2]
Markscheme
139 × 10−3 (10.0 + 0.73)
OR
29.4 × 10−3 (50.0 + 0.73) ✓
1.49 «V» ✓
Watch for ECF from 5(b)(i).
Examiners report
Usually well answered, regardless of b(ii), by utilising the show that value given.
