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Question 19M.3.SL.TZ2.5a

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.SL.TZ2.5a
Level SL Paper 3 Time zone TZ2
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 1]
19M.3.SL.TZ2.5a

Two protons are moving to the right with the same speed v with respect to an observer at rest in the laboratory frame.

(a)

Outline why there is an attractive magnetic force on each proton in the laboratory frame. 

[1]

Markscheme

moving charges give rise to magnetic fields

OR

magnetic attraction between parallel currents ✔

Examiners report

Candidates usually realised that the magnetic field was due to the motion of the protons and that in the proton rest frame there could be no magnetic field. The answers were too often poorly worded and the candidates appeared to reword the question without providing a clear explanation.

Syllabus sections