DP Physics (last assessment 2024)

Question 21N.2.HL.TZ0.5c.ii

Date	November 2021	Marks available	[Maximum mark: 2]	Reference code	21N.2.HL.TZ0.5c.ii
Level	HL	Paper	2	Time zone	TZ0
Command term	Calculate	Question number	c.ii	Adapted from	N/A

c.ii.

[Maximum mark: 2]

21N.2.HL.TZ0.5c.ii

A square loop of side 5.0 cm enters a region of uniform magnetic field at t = 0. The loop exits the region of magnetic field at t = 3.5 s. The magnetic field strength is 0.94 T and is directed into the plane of the paper. The magnetic field extends over a length 65 cm. The speed of the loop is constant.

(c.ii)

The resistance of the loop is 2.4 Ω. Calculate the magnitude of the magnetic force on the loop as it enters the region of magnetic field.

[2]

Markscheme

$I = « \frac{V}{R} = » \frac{0.8}{2.4}$ OR $0.33$ «A» ✓

$F = « N B I L = 85 \times 0.94 \times 0.33 \times 0.05 = » = 1.3$ «N» ✓

Allow ECF from (c)(i).

Award [2] marks for a bald correct answer.

Syllabus sections

Core

Core » Topic 5: Electricity and magnetism » 5.2 – Heating effect of electric currents

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

Core » Topic 5: Electricity and magnetism

Question 21N.2.HL.TZ0.5c.ii

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