Question 23M.3.HL.TZ2.3
| Date | May 2023 | Marks available | [Maximum mark: 5] | Reference code | 23M.3.HL.TZ2.3 |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | Explain, State | Question number | 3 | Adapted from | N/A |
A wire carries an electric current. An external electron e moves with the drift velocity v of the electrons in the wire. Observer O is at rest relative to the wire.
State what is meant by a frame of reference.
[1]
set of coordinates/axes to record position and time «of an event»
OR
a coordinate system which is at rest/not moving relative to the observer ✓
Some mention of time and position for MP1
Allow “set of clocks and rulers” as per MP1
State and explain the nature of the electromagnetic force acting on electron e in the frame of reference of
observer O.
[2]
magnetic ✓
«observer O sees» moving charge in a magnetic field ✓
Do not allow electromagnetic
OWTTE
electron e.
[2]
electric / electrostatic ✓
positive lattice ions are length contracted relative to e
OR
electrons sees positive wire ✓