ELECTRICITY AND MAGNETISM • MAGNETISM A Digital Magnetic Flux Density Unit • Direct measurement of magnetic field strengths • Detects and measures the Earth’s magnetic field • Factory calibrated Hall-effect probe • 0-1V output for connection to data-loggers This unit measures magnetic field strengths directly up to 2000mT (millitesla). Using a Hall-effect probe mounted on a rotatable ball and socket head, the Digital Magnetic Flux Density Meter can be used to investigate the fields around magnets and coils quantitatively and immediately. The probe is permanently attached and is factory calibrated to the meter unit. The unit has 3 ranges 0-19.99, 0-199.9, and 0-1999mT selected by a 3 position switch. The LCD has 12mm digits, suitable for demonstration to small groups. The multi-turn set-zero control can be used to compensate for unwanted background field. On the most sensitive range, the Earth’s magnetic field can be measured. As well as displaying the measured field strength on the LCD, a 0-1V output, proportional to the reading, is available at 4mm sockets for connection to a data-logger voltage sensor. Mass: 1.5kg Size: 240 x 135 x 65mm. Power by mains, with 250mA antisurge fuse.
A
A
Exclusive
F4H28729
each £234.99
B Hall Effect Experiment
B
The semi-conductor germanium, with its high carrier mobility, makes it possible to demonstrate the Hall effect with very simple equipment. The wafer on this board measures 10 x 5 x 1mm and is mounted on a printed circuit panel which allows a magnet to be brought near the wafer surface. A 10kΩ zero balance control is fitted. Two SP2 cells are needed to provide the circulating current and the bar magnet will then produce a Hall voltage which can be read directly on a millivoltmeter. All sockets are 4mm. Nuffield specification 1012. Mass: 0.3kg Size: 110 x 50 x 23mm.
C
F4H28469
P-Type
each £199.99
Hall Effect Experiment F4H28389
N-Type
each £199.99
C Neodymium Magnets Size for size the most powerful magnets to be developed. May be used for many magnetic demonstrations where intense field strength is an important criterion. For example, if a neodymium magnet is dropped down a length of copper plumbing pipe, the eddy currents generated in the copper by the passage of the magnet create a retarding field great enough to noticeably increase the time of fall of the magnet. These face-polarised disc shaped magnets are available in two sizes as follows:
D
E
F4A47132
10 x 8mm
each £2.99
F4A47144
20 x 10mm
each £5.50
D Alcomax Horseshoe Magnets These magnets in ‘Alcomax’ have twelve times the magnetic energy of tungsten steel. Pole gap: 23mm. Height: 30mm. Section: 11 x 30mm.
F4A47077
each £14.99
E Bar Magnets, Plastic Coated
Ceramic Particularly suited to younger pupils. They possess good magnetic strength with very high resistance to demagnetisation, whilst retaining a ‘traditional’ bar magnet appearance by virtue of the red and blue (for N and S) tough plastic casing. Dimensions: 80 x 22 x 10mm.
F4A46929
38
Fax your order form free of charge to 0800
BLACK YELLOW MAGENTACYAN
pack 2 £3.90
138 8881
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19.01.2016
10:21