CN2901476Y - Lenz law demonstrator - Google Patents
Lenz law demonstrator Download PDFInfo
- Publication number
- CN2901476Y CN2901476Y CN200620071835.7U CN200620071835U CN2901476Y CN 2901476 Y CN2901476 Y CN 2901476Y CN 200620071835 U CN200620071835 U CN 200620071835U CN 2901476 Y CN2901476 Y CN 2901476Y
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- CN
- China
- Prior art keywords
- pipe
- magnetic ring
- constant magnetic
- permanent magnetic
- demonstration instrument
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000010949 copper Substances 0.000 claims abstract description 14
- 229910052802 copper Inorganic materials 0.000 claims abstract description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 11
- 239000011810 insulating material Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 239000004020 conductor Substances 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 206010000234 Abortion spontaneous Diseases 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008029 eradication Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 208000015994 miscarriage Diseases 0.000 description 1
- 208000000995 spontaneous abortion Diseases 0.000 description 1
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Abstract
The utility model discloses a Lenz's law demonstration instrument comprising a copper pipe, an aluminum pipe, an insulated pipe, a base and a constant magnetic ring, wherein the copper pipe, the aluminum pipe and the insulated pipe are the same size and vertically arranged on the base, the interior diameter of the constant magnetic ring is slightly larger than the external diameter of the constant magnetic ring. Comparing with the traditional Lenz's law demonstration instrument, the utility model is characterized in more simple structure, lower cost and more convenient use. And by directly observing the motion state of the constant magnetic ring, the demonstrating effect is livelier and the study interest is easier to be stimulated.
Description
Technical field
The utility model relates to a kind of physics teaching demonstration instrument, is a kind of len's law demonstration instrument specifically.
Background technology
Traditional len's law demonstration instrument device mainly contains two kinds, and a kind of is damped pendulum, and another kind is to jump the circle experimental provision.These two kinds of instruments all are to take the excitation unit invariant position, and the mode of observation conductor moving situation is demonstrated, though the demonstration effect is fair, and the structure relative complex, and all need powerful exciting current to produce magnetic field, cost is higher, uses also inconvenient.
Summary of the invention
Goal of the invention of the present utility model is to overcome the defective that prior art exists, provide a kind of simple in structure, cost is low, easy to use, demonstration effect len's law demonstration instrument more intuitively.The utility model len's law demonstration instrument is made up of a copper pipe, aluminum pipe, an eradication edge tubes of material and a base and a permanent magnetic annulus; Described copper pipe, aluminum pipe and insulating material pipe are measure-alike, are vertically mounted on simultaneously on the base; The interior diameter of permanent magnetic annulus is than the big 0.2～3mm of overall diameter of copper pipe.
The utility model len's law demonstration instrument is compared with traditional len's law demonstration instrument device, and by the moving situation of the permanent magnetic annulus of Direct observation, the demonstration effect is more lively, easier motivating students' interest in learning.Simultaneously, observation and contrast by to permanent magnetic annulus falling speed can show deeper physical meaning:
1, induction current is not only relevant with the rate of change in magnetic field, and is also relevant with the resistivity of conductor.This lays foreshadowing for the follow-up content of this course (as reducing the harm of vortex flow, the utilization of vortex flow etc.).
2, guiding student examines the moving situation of magnet ring, can find that it is of short duration accelerated motion that magnet ring begins, and the centre is uniform motion substantially, then shows accelerated motion to the lower end.This phenomenon had both proved Lenz law, had shown the dynamics problem behind the object receiving force again, can be the student further thinking is provided.
Description of drawings
Fig. 1 is the utility model len's law demonstration instrument structural representation;
Specific embodiments
The principle of work of the present utility model and the course of work:
During demonstration permanent magnetic annulus 4 is enclosed within successively the upper end of three pipes, allows its free-falling, can observe following phenomenon: permanent magnetic annulus 4 is the longest along the fall time of copper pipe 1; Fall time along insulating material pipe 3 is the shortest, and is basic identical with freely falling body; Along the fall time of aluminum pipe 2 between along copper pipe 1 and along between the insulating material pipe 3.
The physics principle of above-mentioned phenomenon is explained as follows:
When permanent magnetic annulus during along the free-falling of conductor pipe, the permanent magnetic annulus of motion makes in the conductor pipe and produces induction current, and the variation that causes faradic magnetic field is resisted in the magnetic field that induction current excites conversely, thereby has reduced the falling speed of annulus.As the insulating material pipe that compares with it, because resistivity is very big, almost the influence electricity miscarriage is given birth to, and does not therefore also produce the magnetic field of the permanent magnetic circular motion of opposing, and the falling speed of annulus is basic identical with freely falling body.The resistivity of aluminium is bigger than copper, and the induction current that is produced by permanent magnetic circular motion is less relatively, and the opposing magnetic field that is produced is also less, and therefore permanent magnetic annulus is fast along copper pipe along the whereabouts speed ratio of aluminum pipe, and is slower than insulating material pipe.Above phenomenon has proved the correctness of Lenz law.
Claims (1)
1, a kind of len's law demonstration instrument thoroughly does away with edge tubes of material (3) and base (5) and a permanent magnetic annulus (4) by a copper pipe (1), an aluminum pipe (2), and forms; It is characterized in that: described copper pipe (1), aluminum pipe (2) and insulating material pipe (3) are measure-alike, are vertically mounted on simultaneously on the base (5); The interior diameter of permanent magnetic annulus (4) is than the big 0.2～3mm of overall diameter of copper pipe (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200620071835.7U CN2901476Y (en) | 2006-05-26 | 2006-05-26 | Lenz law demonstrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200620071835.7U CN2901476Y (en) | 2006-05-26 | 2006-05-26 | Lenz law demonstrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2901476Y true CN2901476Y (en) | 2007-05-16 |
Family
ID=38085640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200620071835.7U Expired - Fee Related CN2901476Y (en) | 2006-05-26 | 2006-05-26 | Lenz law demonstrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2901476Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107393385A (en) * | 2017-09-05 | 2017-11-24 | 合肥探奥教育科技有限公司 | A kind of vortex demonstration teaching aid for being applied to teaching |
| CN109030948A (en) * | 2018-08-02 | 2018-12-18 | 王久钰 | The measuring device and measurement method of resistivity |
-
2006
- 2006-05-26 CN CN200620071835.7U patent/CN2901476Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107393385A (en) * | 2017-09-05 | 2017-11-24 | 合肥探奥教育科技有限公司 | A kind of vortex demonstration teaching aid for being applied to teaching |
| CN109030948A (en) * | 2018-08-02 | 2018-12-18 | 王久钰 | The measuring device and measurement method of resistivity |
| CN109030948B (en) * | 2018-08-02 | 2020-09-11 | 王久钰 | Resistivity measuring device and measuring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |