DP Physics (last assessment 2024)
Question 18M.2.SL.TZ1.c.i
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.2.SL.TZ1.c.i |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Explain | Question number | c.i | Adapted from | N/A |
c.i.
[Maximum mark: 1]
18M.2.SL.TZ1.c.i
An electron moves in circular motion in a uniform magnetic field.
The velocity of the electron at point P is 6.8 × 105 m s–1 in the direction shown.
The magnitude of the magnetic field is 8.5 T.
Explain why the electron moves at constant speed.
[1]
Markscheme
the magnetic force does not do work on the electron hence does not change the electron’s kinetic energy
OR
the magnetic force/acceleration is at right angles to velocity
[1 mark]
