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Question 19N.2.SL.TZ0.a

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

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.

Explain why the path of the proton is a circle.

[2]

Markscheme

magnetic force is to the left «at the instant shown»
OR
explains a rule to determine the direction of the magnetic force ✔

force is perpendicular to velocity/«direction of» motion
OR
force is constant in magnitude ✔

force is centripetal/towards the centre ✔

NOTE: Accept reference to acceleration instead of force

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