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Question 19M.2.HL.TZ2.c

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.HL.TZ2.c
Level HL Paper 2 Time zone TZ2
Command term Deduce Question number c Adapted from N/A
c.
[Maximum mark: 2]
19M.2.HL.TZ2.c

A small magnet is dropped from rest above a stationary horizontal conducting ring. The south (S) pole of the magnet is upwards.

While the magnet is moving towards the ring, deduce the direction of the magnetic force on the magnet.

[2]

Markscheme

since the induced magnetic field is upwards

OR

by Lenz law the change «of magnetic field/flux» must be opposed

OR

by conservation of energy the movement of the magnet must be opposed ✔

therefore the force is repulsive/upwards ✔

Examiners report

The majority of candidates recognised that the magnetic force would be upwards and the most common way of explaining this was via Lenz’s law. Students needed to get across that the force is opposing a change or a motion.

Syllabus sections