CAIE IGCSE Physics 4.1 Simple Phenomena of Magnetism Topic Practice

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Covered syllabus points

4.1.1—Forces between magnetic poles and4.1.2—Induced magnetism4.1.3—Differences between the properties of4.1.4—Difference between magnetic and4.1.5—Magnetic field as a region in which a4.1.6—Pattern and direction of magnetic4.1.7—Direction of a magnetic field at a4.1.8—Plotting of magnetic field lines with4.1.9—Uses of permanent magnets and4.1.10—Magnetic forces are due to4.1.11—Relative strength of a magnetic field

Question 1

[Maximum number: 4]

Fig. 7.1 shows three bars of steel, A, B and C.

Fig. 7.1

Fig. 7.1

A student is given the three pieces of steel. Two of the pieces are magnetised and one piece is unmagnetised.

Describe and explain how the student determines which piece is unmagnetised using only the three pieces of steel.

Question 2

[Maximum number: 4]

Fig. 8.1 shows a coil wound around a steel bar that is initially unmagnetised.
Any appropriate power supply can be connected between the terminals A and B . No other apparatus is available.

Fig. 8.1

Fig. 8.1

Describe
- how the steel bar can be magnetised,
- how the steel bar can then be demagnetised.
magnetised:
demagnetised:

Question 3

[Maximum number: 7]

Question (a)

(a)

Fig. 7.1 shows two magnets and the gap between the N pole of one magnet and the S pole of the other magnet.

Fig. 7.1

Fig. 7.1

On Fig. 7.1, draw three lines to show the pattern and direction of the magnetic field in the gap.

[ 2 ]

Question (b)

(b)

Fig. 7.2 is a repeat of Fig. 7.1 showing the two magnets.

On Fig. 7.2, draw the position of a plotting compass needle when it comes to rest in the gap between the N pole and the S pole.

[ 1 ]

Question (c)

(c)

Explain why the needle comes to rest in this position.

[ 2 ]

Question (d)

(d)

Describe a method of demagnetising a bar magnet.

[ 2 ]
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