CN101739876A - Electromagnetic damping presentation device - Google Patents
Electromagnetic damping presentation device Download PDFInfo
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- CN101739876A CN101739876A CN200910200229A CN200910200229A CN101739876A CN 101739876 A CN101739876 A CN 101739876A CN 200910200229 A CN200910200229 A CN 200910200229A CN 200910200229 A CN200910200229 A CN 200910200229A CN 101739876 A CN101739876 A CN 101739876A
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- presentation device
- electromagnetic damping
- metallic conductor
- conductor
- magnetic body
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Abstract
The invention discloses an electromagnetic damping presentation device, relating to a presentation device for teaching. The presentation device comprises a metal conductor which is not easy to magnetize and a magnetic body, wherein the metal conductor is vertically arranged and provided with a strip-shaped cavity body in which the magnetic body can pass through; the metal conductor can be considered as a closed conductor, the magnetic body passes through a metal pipe cavity, falls off and cuts a magnetic force line so that the closed conductor generates induced current, and the motion of the magnetic body can be blocked by the magnetic field generated by the induced current, therefore, the electromagnetic damping phenomenon is generated, which shows that the falling speed of the magnetic body becomes slow and the time becomes long. The presentation device has simple structure, intuitional effect and clear display.
Description
Technical field
The present invention relates to a kind of physics apparatus for demonstrating, the particularly a kind of device that can demonstrate the electromagnetic damping phenomenon.
Background technology
The electromagnetic damping phenomenon is important notion in the senior middle school physics curriculum, and its phenomenon shows: when closed conductor and magnet generation relative motion, can produce electromagnetic resistance between the two, this electromagnetic resistance can hinder relative motion between the two.This phenomenon comes from electromagnetic induction principle, and can make an explanation: when closed conductor and magnet generation cutting magnetic line movement with Lenz law, because the magnetic flux that closed conductor penetrated changes, closed conductor can produce induced current, and the magnetic field that this electric current produced can hinder both relative motions.Its resistance size is proportional to physical quantitys such as the magnetic induction density, speed of related movement of magnet.
After the principle of having understood the generation of electromagnetic damping phenomenon, how to allow the student that this abstract phenomenon is had a directly perceived and perceptual understanding, carry out on-the-spot demonstration with regard to a kind of device of needs.And the most volume of existing apparatus for demonstrating is big, complex structure, cost height, inconvenience move.
Summary of the invention
The object of the present invention is to provide a kind of electromagnetic damping presentation device, this device is not only simple in structure, easy to operate, and demonstrative process is directly perceived, easy to understand.
For solving the problems of the technologies described above, the present invention adopts technical scheme as follows:
A kind of electromagnetic damping presentation device comprises a metallic conductor that is difficult for being magnetized and a magnet, and described metallic conductor is a vertically installation, and the elongated cavity body that can supply described magnet therefrom to pass.
Described metallic conductor can be regarded as a closed conductor that is formed by a circle circle plain conductor coiling, when described magnet passes its cavity body whereabouts from the top of metallic conductor, and between closed conductor cutting magnetic line movement takes place, closed conductor produces induced current, and the magnetic field that this electric current produced can hinder both relative motions.As a comparison, place the plastic tube of an equal length on the next door of this device, allow magnet fall along this plastics tube chamber, at this moment, magnet will be done the movement of falling object, can find that the velocity ratio that magnet falls falls to obviously wanting fast in metallic conductor, and the required time that lands obviously will be lacked.Therefore,, classmates are come into plain view to this electromagnetic damping phenomenon by device provided by the present invention, very directly perceived.Metallic conductor as closed conductor among the present invention must be the material that is difficult for being magnetized, such as copper, aluminium, aluminium alloy or tin etc., necessarily can not be iron etc. easily by the material of attraction, otherwise magnetic ball will be attracted on the metal wall of the lumen when falling.
Also have, in the magnet dropping process, the influence and the interference of the tube chamber of metallic conductor and the factors such as shape of magnet, the xsect of described metallic conductor is circular, magnet is spherical.The carrying and moving of this apparatus for demonstrating for convenience, the support of described fixing metal electric conductor is portable.For the ease of observing the process that magnet falls, under the tube chamber of described metallic conductor, place a bulb.
Description of drawings
Below by accompanying drawing technical solution of the present invention is done a detailed description:
Fig. 1 is the structural representation of one embodiment of the invention;
Embodiment
In the structural representation of one embodiment of the invention shown in Figure 1, tubular metal electric conductor 2 vertically is fixed on the cross bar of support 5, uses for convenience, can make this support 5 portable.Under the tube chamber of metallic conductor 2, place one and collect box 4, so that magnetic ball 1 collects box 4 down falling into this.Observe for convenient, on this collects box 4, a bulb 3 is placed in the tube chamber position that faces metallic conductor 2.
During demonstration, the top mouth of pipe of magnetic ball 1 from metallic conductor 2 discharged, observed phenomenon is that magnetic ball 1 slowly falls in the metal tube chamber, drops at last to collect in the box 4.
Claims (9)
1. an electromagnetic damping presentation device comprises a metallic conductor that is difficult for being magnetized and a magnet, it is characterized in that: described metallic conductor is a vertically installation, and the elongated cavity body that can supply described magnet therefrom to pass.
2. electromagnetic damping presentation device according to claim 1 is characterized in that: described metallic conductor is copper, aluminium, aluminium alloy or tin.
3. electromagnetic damping presentation device according to claim 1 and 2 is characterized in that: the xsect of described metallic conductor is circular.
4. electromagnetic damping presentation device according to claim 1 and 2 is characterized in that: described magnet is spherical.
5. electromagnetic damping presentation device according to claim 1 and 2 is characterized in that: described metallic conductor is fixedly mounted on the support.
6. electromagnetic damping presentation device according to claim 5 is characterized in that: described support is portable.
7. electromagnetic damping presentation device according to claim 1 is characterized in that: place one under the tube chamber of described metallic conductor and collect box.
8. electromagnetic damping presentation device according to claim 1 is characterized in that: place a bulb under the tube chamber of described metallic conductor.
9. electromagnetic damping presentation device according to claim 7 is characterized in that: described collecting on the box, under facing the tube chamber of metallic conductor, place a bulb.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910200229A CN101739876A (en) | 2009-12-10 | 2009-12-10 | Electromagnetic damping presentation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910200229A CN101739876A (en) | 2009-12-10 | 2009-12-10 | Electromagnetic damping presentation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101739876A true CN101739876A (en) | 2010-06-16 |
Family
ID=42463301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910200229A Pending CN101739876A (en) | 2009-12-10 | 2009-12-10 | Electromagnetic damping presentation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101739876A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103150953A (en) * | 2013-03-20 | 2013-06-12 | 郑扬威 | Lenz's law demonstration device |
| CN107389506A (en) * | 2017-09-14 | 2017-11-24 | 深圳市先波科技有限公司 | It is a kind of based on fall magnetic method detection liquid viscosity detection means and its detection method |
| CN113436513A (en) * | 2021-07-20 | 2021-09-24 | 吴雪利 | Physical experiment demonstration equipment for middle school education |
-
2009
- 2009-12-10 CN CN200910200229A patent/CN101739876A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103150953A (en) * | 2013-03-20 | 2013-06-12 | 郑扬威 | Lenz's law demonstration device |
| CN103150953B (en) * | 2013-03-20 | 2015-08-12 | 郑扬威 | A kind of demonstrator for Lenz law |
| CN107389506A (en) * | 2017-09-14 | 2017-11-24 | 深圳市先波科技有限公司 | It is a kind of based on fall magnetic method detection liquid viscosity detection means and its detection method |
| CN107389506B (en) * | 2017-09-14 | 2019-03-26 | 深圳市先波科技有限公司 | It is a kind of based on fall magnetic method detection liquid viscosity detection device and its detection method |
| CN113436513A (en) * | 2021-07-20 | 2021-09-24 | 吴雪利 | Physical experiment demonstration equipment for middle school education |
| CN113436513B (en) * | 2021-07-20 | 2022-02-11 | 吴雪利 | Physical experiment demonstration equipment for middle school education |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100616 |