RU188542U1 - MODEL OF MAGNETIC SHEET AMPER - Google Patents

Abstract

The utility model relates to educational devices and can be used in a demonstration experiment and laboratory work of a physics course in general education institutions. The task of the utility model is to use the proposed device as a model of Ampere magnetic sheet. The device consists of a flat ordered lattice, in the nodes of which there are identical permanent magnets, the magnetic induction vectors of the magnets are equally directed and perpendicular to the lattice plane. The magnets are secured in a plastic sheet, the plastic sheet on both sides is covered with plastic transparent sheets. 4 il.

Description

The utility model relates to educational devices and can be used in a demonstration experiment and laboratory work of a physics course in general education institutions for studying and deepening knowledge of physical laws and phenomena.

A device is known for demonstrating the superposition of magnetic fields (PA Rymkevich. Physics course. M .: Higher School, 1975, p. 232, Fig. 144). It contains three closed circuits that include an inductor, a switch and a current source. This device allows you to demonstrate the principle of superposition of magnetic fields from three sources of magnetic fields. However, such a device from three sources of magnetic fields cannot serve as an illustration of the Ampere theorem in the form of a magnetic sheet, which states that the magnetic field of an extremely thin flat magnet (magnetic sheet formed of equally oriented elementary magnets) is identical to the field of a closed linear current flowing along the contour of magnet (Physical Encyclopedic Dictionary Moscow. Scientific publishing house “Big Russian Encyclopedia” 1995 p. 21 “Ampere theorem”) and not enough to use as a model to demonstrate the Ampere's hypothesis about the nature of the magnetic field of the permanent magnet.

Polymeric magnetic sheets are known (“Magnetized advertisement”, Y. Spichkin, applied publications of the staff of the company “Promising magnetic technologies and consultations” (AMT & C),

http://www.amtc.ru/publications/articles/2030/?SHOWALL_1=1), which is a material made from a special polymer mixture with the addition of magnetic powder, which use a multi-pole magnetization configuration, with alternating stripes of the north and south magnetic poles. Such sheets cannot be used as a model of the Ampere magnetic sheet, “formed from equally oriented elementary magnets”, since the condition of the same orientation of the magnetized portions of the polymer sheet is not satisfied.

The task of the utility model is to use a larger number of magnetic field sources than in the first mentioned device, and to fulfill the condition of the same orientation of the magnets as opposed to polymer magnetic sheets for using the proposed device as a model of the Ampere magnetic sheet.

The task of the utility model is achieved by the fact that the proposed device consists of a flat ordered lattice, at the nodes of which there are identical permanent magnets, the magnetic induction vectors of the magnets are equally directed and perpendicular to the plane of the lattice. The magnets are secured in a plastic sheet, the plastic sheet on both sides is covered with plastic transparent sheets.

The model of the Ampere magnetic sheet is illustrated by the drawings in FIG. 1 and 2.

Identical permanent magnets (1) are arranged in the form of an ordered lattice and fixed in a plastic sheet (2). The plastic sheet (2) is closed on both sides by transparent plastic sheets (3) In Ampere's hypothesis about the nature of magnetism, the magnetic field of a permanent magnet is created by superposition of elementary magnetic fields created by elementary currents inside the magnet. In the proposed device, the role of sources of magnetic fields is performed by the same magnets, arranged in the form of an ordered lattice - they form a magnetic sheet. The magnetic field of a permanent magnet is created by a multitude of parallel-arranged magnetic sheets with equally directed magnetic induction vectors. The demonstration of a magnetic sheet and Ampere's hypothesis on the nature of the magnetic field of a permanent magnet is illustrated in FIG. 3. The device is inserted perpendicular to the demonstration screen (4), into the slot (5) of the middle part of the screen. Iron filings (6) are poured on the screen, the location of which reflects the magnetic field lines of the device due to the superposition of the magnetic fields of the sources - permanent magnets. The picture of the location of iron sawdust from the proposed device is similar to the location of iron sawdust from a solid permanent magnet.

The second way of demonstrating a magnetic sheet and Ampere's hypothesis about the nature of the magnetic field of a permanent magnet is illustrated in FIG. 4. Instead of iron filings, magnetic arrows (7) are installed on the screen (4), with the help of which the direction of the magnetic induction lines is demonstrated due to the superposition of the magnetic fields of the device’s permanent magnets.

The textbooks of physics of general education schools give a verbal description of the magnetic properties of permanent magnets: the French scientist Ampère explained the magnetization of iron and became the existence of electrical currents that circulate inside each molecule of these substances. (AV Peryshkin, Class 8 Physics. Bust. 2017). A similar description is also found in other textbooks: drawings illustrating the above text are used. There are no demonstration experiments explaining Ampere's hypothesis. The Ampere magnetic sheet model I made was used in the 2017-2018 school year when studying the topic “Magnetic field” in the 8th and 9th grades of secondary school. The conducted demonstration experiments provided better learning of the educational material than the explanation of this material using only diagrams, drawings and presentations.

Claims (1)

The Ampere magnetic sheet model, characterized in that the device proposed as the Ampere magnetic sheet model consists of a flat, ordered lattice, at the nodes of which there are identical permanent magnets, magnetic induction vectors of the magnets are equally directed and perpendicular to the lattice plane, the magnets are fixed in a plastic sheet, the plastic sheet is closed on both sides by plastic transparent sheets.

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