DP Physics (last assessment 2024)

Question 19N.2.SL.TZ0.b(i)

Date	November 2019	Marks available	[Maximum mark: 2]	Reference code	19N.2.SL.TZ0.b(i)
Level	SL	Paper	2	Time zone	TZ0
Command term	Show that	Question number	b(i)	Adapted from	N/A

b(i).

[Maximum mark: 2]

19N.2.SL.TZ0.b(i)

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.

The speed of the proton is 2.0 × 10⁶ m s^–1 and the magnetic field strength B is 0.35 T.

Show that the radius of the path is about 6 cm.

[2]

Markscheme

$q v B = \frac{m v^{2}}{R}$ ✔

$R = \frac{1.67 \times 10^{- 27} \times 2.0 \times 10^{6}}{1.6 \times 10^{- 19} \times 0.35}$ OR 0.060 « m »

NOTE: Award MP2 for full replacement or correct answer to at least 2 significant figures

Syllabus sections

Core

Core » Topic 5: Electricity and magnetism » 5.4 – Magnetic effects of electric currents

Core » Topic 2: Mechanics » 2.3 – Work, energy, and power

Core » Topic 2: Mechanics

Core » Topic 5: Electricity and magnetism

Question 19N.2.SL.TZ0.b(i)

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