O-LevelPhysicsMagnetism5054/21 · Oct/Nov 2019 · Q815 Marks

A small electric component in a circuit needs to be protected from a strong, external magnetic field.

(a)Describe how this is done and state any material used.[2]
(b)(i)Electromagnets have many domestic and industrial applications. In the space, draw a diagram of a simple electromagnet.[3]
(b)(ii)State and describe in detail one use of an electromagnet.[3]
(c)(i)Fig. 8.2 shows a solenoid connected to a sensitive ammeter. [Figure 8.2] Explain what is observed on the ammeter when a student: inserts an N-pole of a bar magnet slowly into the right-hand end of the solenoid[3]
(c)(ii)holds the bar magnet stationary in the solenoid[1]
(c)(iii)withdraws the N-pole of the magnet quickly from the right-hand end of the solenoid.[3]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2019). The mark or mark type is shown in brackets.

[B1] surround the component with a box or use of iron mentioned
[B1] surround the component with (a box of) iron
[B1] solenoid and d.c. power supply and switch
[B1] core
[B1] iron core
[B1] named or described use
[B1] what happens when electromagnet is switched on
[B1] current causes magnetisation or description of what happens when electromagnet is switched off
[B1] ammeters deflects / shows a reading
[B1] magnetic field lines cut by solenoid or changing magnetic field in coil
[B1] e.m.f. / voltage induced
[B1] no deflection and no (magnetic) field lines cut or constant field
[B1] larg(er) deflection
[B1] opposite deflection
[B1] field lines cut in opposite sense or opposite change in (magnetic) field or field lines cut faster

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