DP Physics (last assessment 2024)
Question 19M.2.HL.TZ2.4bi
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.2.HL.TZ2.4bi |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | State | Question number | bi | Adapted from | N/A |
bi.
[Maximum mark: 1]
19M.2.HL.TZ2.4bi
Three identical light bulbs, X, Y and Z, each of resistance 4.0 Ω are connected to a cell of emf 12 V. The cell has negligible internal resistance.
(bi)
The switch is now closed. State, without calculation, why the current in the cell will increase.
[1]
Markscheme
«a resistor is now connected in parallel» reducing the total resistance
OR
current through YZ unchanged and additional current flows through X ✔
Examiners report
Most recognised that this decreased the total resistance of the circuit. Answers scoring via the second alternative were rare as the statements were often far too vague.
