• A Hall probe can be used to measure the?magnetic flux density?between two magnets based on the Hall effect
• It consists of a cylinder with a flat surface at the end

A Hall probe consists of a flat surface and is held so the magnetic field lines are perpendicular to it

• To measure the magnetic flux density between two magnets, the flat surface of the probe must be directed between the magnets so the?magnetic field?lines pass completely perpendicular to this surface

• The probe is connected to a voltmeter to measure the?Hall voltage
• If the probe is not held in the correct orientation (perpendicular to the field lines), the voltmeter reading will be reduced
• Since the Hall voltage is directly proportional to the magnetic flux density, the flux density of the magnets can be obtained
• A Hall probe is sensitive enough to measure even the Earth’s magnetic flux density

• The Hall voltage depends on angle between the magnetic field and the plane of the probe
• The Hall voltage reaches a?maximum?when the field is?perpendicular?to the probe
• The Hall voltage is?zero?when the field is?parallel?to the probe