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Question 18M.3.SL.TZ1.3b.ii

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.SL.TZ1.3b.ii
Level SL Paper 3 Time zone TZ1
Command term Deduce Question number b.ii Adapted from N/A
b.ii.
[Maximum mark: 2]
18M.3.SL.TZ1.3b.ii

The diagram shows the motion of the electrons in a metal wire carrying an electric current as seen by an observer X at rest with respect to the wire. The distance between adjacent positive charges is d.

M18/4/PHYSI/SP3/ENG/TZ1/03

Observer Y is at rest with respect to the electrons.

(b.ii)

Deduce whether the overall field around the wire is electric, magnetic or a combination of both according to observer Y.

[2]

Markscheme

positive charges are moving, so there is a magnetic field

the density of positive charges is higher than that of negative charges, so there is an electric field

 

The reason must be given for each point to be awarded.

[2 marks]

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