Question 22M.2.HL.TZ2.a.i
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.2.HL.TZ2.a.i |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Write down | Question number | a.i | Adapted from | N/A |
A fixed horizontal coil is connected to an ideal voltmeter. A bar magnet is released from rest so that it falls vertically through the coil along the central axis of the coil.
The variation with time t of the emf induced in the coil is shown.
Write down the maximum magnitude of the rate of change of flux linked with the coil.
[1]
«−» 5.0 «mV» OR 5.0 × 10−3 «V» ✓
Accept 5.1
ai
Well answered, with wrong answers stating 8 for the difference or 3 without realising that the sign does not matter.
aii
Very few candidates managed to get the correct fundamental SI unit for V. All kinds of errors were observed, from power errors to the use of C as a fundamental unit instead of A.
bi) Most scored best by marking using an alternative method introduced to the markscheme in standardisation. There were some confused and vague comments. Clear, concise answers were rare.
bii) It was common to see conservation of energy invoked here with suggestions that energy was the area under the graph. Many candidates described the shapes to explain why the areas were the same rather than talking about the physics e.g. one peak is short and fat and the other is tall and thin so they balance out.
c) A surprising number didn't pick up on the fact that the magnet would be moving slower. As a result, they discussed everything happening sooner, i.e. the interaction with the magnet and the coil, and that led onto things happening quicker so peaks being bigger.
