DP Physics (first assessment 2025)
Question 20N.2.HL.TZ0.a
| Date | November 2020 | Marks available | [Maximum mark: 3] | Reference code | 20N.2.HL.TZ0.a |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Explain | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 3]
20N.2.HL.TZ0.a
Explain, by reference to Faraday’s law of induction, how an electromotive force (emf) is induced in the coil.
[3]
Markscheme
there is a magnetic flux «linkage» in the coil / coil cuts magnetic field ✓
this flux «linkage» changes as the angle varies/coil rotates ✓
«Faraday’s law» connects induced emf with rate of change of flux «linkage» with time ✓
Do not award MP2 or 3 for answers that don’t discuss flux.
Examiners report
This question was well answered with the majority discussing changes in flux rather than wires cutting field lines, which was good to see.
