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2 110 Magnetism Permanent magnets U-Shaped magnet, Al-Ni-Co A magnetized Al-Ni-Co block attached to two parallel mild steel pole pieces. Overall dimensions 30 x 82 x 135 mm. Distance between poles 59 mm. With keeper and coloured poles U-Shaped magnet, Al-Ni-Co U-Shaped magnet, Al-Ni-Co Like but smaller. Overall dimensions 15 x 60 x 90 mm. Distance between poles 48 mm U-Shaped magnet, Al-Ni-C Lodestone Specimen for demonstration. A small piece of magnetic iron ore Lodestone Bar magnets, Al-Ni-Co with holder Cylindrical magnets, 11 mm diameter, length 170 mm, with keepers and coloured poles. Supplied in a wooden holder Bar magnets, Al-Ni-Co Bar magnets, Al-Ni-Co Like but without wooden holder Bar magnets, Al-Ni-Co Bar magnets, Al-Ni-Co A pair of square section magnets 10 x 10 mm with coloured poles. Length 100 mm Bar magnets, Al-Ni-Co Cylindrical magnet, Neodymium Diameter 30 mm, thickness 6 mm. Mounted in a holder on a 10 mm diameter stainless steel rod. Can be used in conjunction with induction coils for the demonstration of alternating current (AC) Cylindrical magnet Cylindrical magnet with bearing Like , but with ball bearing and pulley Cylindrical magnet with bearing

3 Magnetism 111 Bar magnets, Al-Ni-Co, cylindrical Pair of cylindrical magnets, 5 mm diameter, length 50 mm Bar magnets, Al-Ni-Co Bar magnet AI-Ni-Co, square Pair of square section magnets 15 x 10 mm. Length 50 mm Bar magnets AI-Ni-Co Warning! Strong magnets are dangerous if swallowed! Never allow small children to work with neodymium magnets without adult supervision. Never store or use these magnets near computer disks, credit cards or other magnetic media Support for bar magnet For holding a bar magnet to demonstrate repulsion and atraction. Made of nickel-plated brass. Requires a stand e.g For magnets up to max. 11 mm square or diameter Support for bar magnet Horseshoe magnet Made of 6 % chrome steel, Supplied with keeper. Overall length 125 mm Horseshoe magnet Materials set for magnetism Consists of 8 plates of magnetic and non-magnetic materials each 65 x 25 mm. Materials provided are: Brass, nickel, lead, copper, aluminium, iron, zinc and plastic Materials set for magnetism Neodymium magnets Neodymium magnets are rare earth magnets containing iron, neodymium and boron. These magnets are very powerful and they are capable of detecting magnetic properties in materials you would never have expected. Whenever the topic of magnetism is investigated these magnets are excellent for illustrating magnetic properties. Great for induction experiments. Place a magnet on either side of the palm of your hand just to illustrate how powerful they are Neo-magnets Ø 10 x 6 mm, boxed pair Neo-magnets Ø 10 x 8 mm, boxed pair Neo-magnets Ø 14 x 8 mm, boxed pair

4 112 Magnetism Iron filings 150 g of iron filings in polythene shaker Iron filings Magnetic field demonstrator Elegant and easy to use a handy replacement of iron filings. The perfect aid for clearly revealing the magnetic field lines in 2 or 3 dimensions. Equally suited for demonstration purposes and student experiments. The kit consists of 4 plastic plates which contain a total of 392 small 8 mm magnetic pins. The plates are transparent and can be used with an overhead projector. Dimensions of each plate: 153 x 77 x 6 mm Magnetic field demonstrator

5 Magnetism 113 Magnetic field demonstrator For demonstration of two- and three-dimensional magnetic field lines. The set includes a magnetic field box, a magnetic field plate and three magnets (2 bar magnets and a horseshoe magnet). The magnetic field box and the plate contain iron filings suspended in a viscous liquid. A bar magnet can be placed in the middle of the box. The plate can be used with both bar magnet and horseshoe magnet. Dimensions, box: 76 x 76 x 76 mm, plate: 91 x 157 x 9 mm Magnetic field demonstrator Lenz s Law, open version Demonstration of magnetic braking. When a strong magnet rolls down the aluminium U-profile, the changing magnetic field will induce an eddy current in the U- profile. According to Lenz s law, this current will generate a new magnetic field opposing the changes in the original field. The motion will be slowed down dramatically. Delivered with two neodymium magnets and two non-magnetic dummies of stainless steel Lenz s Law Magnetic field demonstrator For demonstration of two-dimensional magnetic field lines. The field is visualized by iron filings suspended in a viscous liquid. (Magnet not included.) Dimensions: 223 x 122 x 11 mm Magnetic field demonstrator Lenz law kit Copper tube, length 18 cm and two ring shaped neodymium magnets Lenz law kit

6 114 Magnetism Compasses Compasses, transparent Useful in demonstrations of magnetic field strength. The compass needle is supported in a sealed plastic housing with transparent top and bottom. Well suited for use on an overhead projector. Diameter: 19 mm. Package of Compasses, transparent Compass SILVA Ranger Transparent base plate 11 x 54 mm, with magnifying lens and scales. Dial 360. Alcohol-filled Ø 50 mm rotatable house. Needle is with agate pivot Compass SILVA Ranger Storage case for Case with lining for storing up to 24 SILVA compasses Storage case for Pocket compass Low cost pocket compass with 360 dial with 5 graduation. Nickel plated brass housing. Needle placed on stone bearings. Ø 40 mm Pocket compass Compass, low cost Land compass with 360 graduation. Transparent base plate. Liquid filled compass housing Compass, low cost

7 Magnetism 115 Dip needle for suspension With magnetic steel needle, 105 mm long, fully rotatable. Mounted in holder with agate cup bearings and suspension hook Dip needle for suspension Dip needle on base With magnetic steel needle, 105 mm long, fully rotatable. Mounted in a holder with agate cup bearings and inclination scale. The system can be moved from the vertical to the horizontal plane and serve as an ordinary magnetic needle Dip needle on base Compass card, cardboard The diameter of the compass card is 65 mm Compass card, cardboard Magnetic needle Carbon Steel with nickel-plated brass bearing pivot. Length 110 mm. (Stand not included.) Magnetic needle Stand for magnetic needle Non-magnetic metal pillar with carbon steel point on stable base. Height 110 mm Stand for magnetic needle Demonstration magnetic needle Length 150 mm with coloured polarity indication and agate cup bearing. Base with needle is included Demonstration magnetic needle

8 116 Magnetism Magnetic field pattern, vertical conductor With a 149 x 200 mm Perspex base with 4 mm sockets. Can be used on an overhead projector. The field is made visible with iron filings Magnetic field pattern, vertical conductor Induction coil, hanging This is used along with a cylindrical magnet with bearing for demonstrating induced voltages. Because the coil windings can be pulled apart, the rotatable magnet can be mounted within the coil and rotated using a small motor (no ). The diameter of the copper wire is 2 mm. The length of the un-stretched coil is 200 mm Induction coil, hanging Magnetic field pattern, 1 turn Like but with a single turn coil Magnetic field pattern, 1 turn Magnetic field pattern, 10 turns Like but with a ten turns coil Magnetic field pattern, 10 turns Hans Christian Ørsted s apparatus This apparatus is used to demonstrate the action of a current carrying conductor on a compass needle. The compass needle and the current carrying conductor are mounted on a transparent acrylic plate with a compass card. A DC current of up to about 3 A is sent through the conductor via 4 mm safety jacks. The device can be used on an overhead projector. Length of the compass needle: 105 mm H.C. Ørsted s apparatus

9 Magnetism 117 Pohl swing For demonstration of the force on a current carrying wire in a magnetic field. Height: 270 mm Width: 100 mm Depth: 160 mm Pohl swing Apparatus for Laplace s law This apparatus demonstrates the force on a conductor in a magnetic field. It consists of a pair of metal rails with 4 mm terminals. A light aluminium axle can roll freely along the rails and thus completes the electrical contact between them. A strong U-shaped magnet is required to complete the setup, use e.g. item no (not included). Place the axle on the rails between the poles of the magnet. When a current flows through the axle, it will be influenced by a force perpendicular to both the axle and the magnetic field i.e. along the rails. Dimensions: 190 x 85 x 65 mm Apparatus for Laplace s law Current balance I For demonstrating and measuring the interaction between an electric conductor and a magnetic field. The proportionality between force, current and conductor length can be shown. The equipment consists of a magnet holder with removable permanent magnets and a holder for wire frames which are mounted by means of 4 mm plugs. The set consists of: 1 magnet holder with 6 permanent magnets 1 holder for wire frames 6 wire frames with wire lengths of cm For the experiment you will also need a retort stand, a balance with 0.01 g accuracy and a variable DC power supply. A power supply with a variable current limiter like is most convenient Current balance I Current balance II This is an extension for in order to show the angle dependency of the magnetic force. The permanent magnet assembly has a large gap in order to allow the vertical part of the conductor to rotate in the field. The scale has one degree subdivisions and can easily be zeroed. (You will also need as well as a stand, a balance and a power supply.) Current balance II

10 118 Magnetism Magnaprobe Designed for work with magnetic fields in the laboratory. Alternative to plotting compasses when investigating the fields around magnets or coils etc Magnaprobe Teslameter This simple, user-friendly instrument is designed to measure high magnetic field strengths e.g. from AINiCo magnets, coils and electromagnetic experiments. An auto scaling feature provides automatic switching between measuring ranges. Measuring ranges: T (resolution 1 mt) mt (resolution 0,1 mt) Precision: 5% Size: Magnetic field probe (without holder): 80 mm long, 8 mm wide, 2 mm thick. Readout instrument: 158 x 108 x 56 mm. Includes power supply for 230 V AC European plug Teslameter