DP Physics (last assessment 2024)
Question 23M.3.SL.TZ1.3
| Date | May 2023 | Marks available | [Maximum mark: 3] | Reference code | 23M.3.SL.TZ1.3 |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Discuss, Outline | Question number | 3 | Adapted from | N/A |
3.
[Maximum mark: 3]
23M.3.SL.TZ1.3
A proton is moving in a region of magnetic field of strength B. The speed of the proton relative to the magnetic field is v.
In the reference frame in which the magnetic field is at rest, the proton experiences an initial magnetic force evB upwards.
(a)
Outline why there can be no magnetic force on the proton in the proton’s rest frame.
[1]
Markscheme
«in the proton rest frame » the speed of the proton is zero so force is zero ✓
(b)
Discuss the nature of the force in the proton’s rest frame.
[2]
Markscheme
the proton sees an electric field / experiences electric force ✓
upward force ✓
