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Question 19N.2.SL.TZ0.4c

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.2.SL.TZ0.4c
Level SL Paper 2 Time zone TZ0
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 2]
19N.2.SL.TZ0.4c

A proton is moving in a region of uniform magnetic field. The magnetic field is directed into the plane of the paper. The arrow shows the velocity of the proton at one instant and the dotted circle gives the path followed by the proton.

(c)

Explain why the kinetic energy of the proton is constant.

[2]

Markscheme

ALTERNATIVE 1
work done by force is change in kinetic energy ✔
work done is zero/force perpendicular to velocity ✔

NOTE: Award [2] for a reference to work done is zero hence Ek remains constant

 

ALTERNATIVE 2
proton moves at constant speed ✔
kinetic energy depends on speed ✔

NOTE: Accept mention of speed or velocity indistinctly in MP2

 

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