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CAIE A-Level Physics 20.1 Concept of a Magnetic Field

Practise defining magnetic fields, identifying their sources and representing direction and relative strength with field-line patterns.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • explain sources of magnetic fields and represent field-line patterns
  • interpret field-line direction and spacing to compare field strength

Covered syllabus points

20.1.1—A magnetic field is an example of a field of force produced either by moving20.1.2—A magnetic field by field lines

20.1 Concept of a magnetic field question 1

[Maximum number: 2]

State what is meant by a magnetic field.

20.1 Concept of a magnetic field question 2

[Maximum number: 3]

Question (a)

(a)

State what is meant by a magnetic field.

[ 2 ]

Question (b)

(b)

A particle of charge +q and mass m is travelling in a vacuum with speed v. The particle enters, at a right angle, a uniform magnetic field of flux density B, as shown in Fig. 8.1.

Fig. 8.1

Fig. 8.1

The particle leaves the field after following a semi-circular path of diameter d.

[ 1 ]

Question (i)

(i)

State the direction of the magnetic field.

[ 1 ]
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