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CAIE A-Level Physics 20.3.4 Hall Probe

Practise using a calibrated Hall probe with the correct orientation and Hall voltage to measure magnetic flux density, explaining the measurement principle and reading.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • explain how a Hall probe is used to measure magnetic flux density
  • identify the measurement principle, calibration or orientation required for a Hall probe

20.3.4—The use of a Hall probe to measure magnetic flux density question 1

[Maximum number: 3]

A Hall probe is placed near to one end of a current-carrying solenoid, as shown in Fig. 9.1.

Fig. 9.1

Fig. 9.1

The probe is rotated about the axis XY and is then held in a position so that the Hall voltage is maximum.

The probe is now rotated through an angle of 360∘360^{\circ} about the axis XY . At angle θ=0\theta=0, the Hall voltage VHV_{\mathrm{H}} has maximum value VMAX V_{\text {MAX }}.

On Fig. 9.2, sketch the variation with angle θ\theta of the Hall voltage VHV_{\mathrm{H}} for one complete revolution of the probe about axis XY.

Fig. 9.2

Fig. 9.2

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