CN202855154U

CN202855154U - Demonstrator for verifying Lenz's law

Info

Publication number: CN202855154U
Application number: CN201220477767.XU
Authority: CN
Inventors: 张云汾; 斯建平
Original assignee: LIHE MANGETIC INDUSTRY Co Ltd NINGBO CITY
Current assignee: LIHE MANGETIC INDUSTRY Co Ltd NINGBO CITY
Priority date: 2012-09-19
Filing date: 2012-09-19
Publication date: 2013-04-03
Anticipated expiration: 2022-09-19

Abstract

The utility model provides a demonstrator for verifying Lenz's law. The demonstrator comprises a non-magnetic metal pipe which can generate induced current. A side face of the metal pipe is provided with a slender observation window. The demonstrator is characterized in that: the metal pipe is internally provided with a magnetic steel and an iron core which have a same size, and an upper end and a lower end of the metal pipe are provided with rubber end covers for fixation; and front and back ends of the magnetic steel and the iron core are attached with rubber heads. The end covers can be directly inserted at two ends of the metal pipe and also can be connected to the two ends of the metal pipe through screws. The above device has the advantages of simple structure, low cost, simple demonstrator method and obvious effect, an abstract principle is vividly converted into an understandable phenomenon, so students can easily master the principle of Lenz's law, and convenience is brought for the explanation of a teacher.

Description

A kind of demonstration device of verifying Lenz law

Technical field

The utility model relates to a kind of education demonstrator, particularly a kind of demonstration device of verifying Lenz law.

Background technology

High school physics class learning Lenz law, in teaching material, put down in writing in order to verify material object that Lenz law will be used and with the demenstration method of this visual illustration Lenz law.The method mainly is to say: allow magnet pass the coil of conducting, observe simultaneously the variation of the pointer deflection on the reometer that is connected in the coil circuit, the magnetic pole that then changes magnet repeats above-mentioned process again.The method and demonstration effect thereof are bad, and will use electronic device and the multiple coil of reometer and so on, and its material is more, spends highlyer, are unfavorable for demonstrating under the students in class deepening the impression.

Chinese patent is also reported some apparatus for demonstrating, all is stored in complex structure, the defective of cost costliness.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of simple in structure and low obvious a kind of demonstration device of verifying Lenz law of effect of cost.

The utility model addresses the above problem the technical scheme that proposes: a kind of demonstration device of verifying Lenz law, it comprises non-magnetic and can produce faradic metal tube, its side is provided with elongated view window, be arranged with the consistent magnet steel of size and iron core on the metal tube, the upper and lower side of metal tube is provided with end cover rubber and is fixed.

As improvement, the upper and lower side of magnet steel and iron core all is stained with Rubber end.

As further improvement, end cap directly eye-splice also can be to be connected by screw on the two ends that are fixed on metal tube at the two ends of metal tube.

Compared with prior art, its advantage is: the utility model is structurally simple than other equal products, and cost is low, not only demenstration method is simple, and its demonstration effect is also obvious, it with abstract principle vivid change into straightaway phenomenon, make the student can be easy to grasp the principle of Lenz law, brought convenience for teacher's explanation simultaneously.

Description of drawings

Fig. 1 is cut-open view of the present utility model;

Fig. 2 is rear view of the present utility model;

Fig. 3 is that Fig. 2 is along the cut-open view of A-A line;

Embodiment

Embodiment is described in further detail the utility model below in conjunction with accompanying drawing.

As shown in the figure, a kind of demonstration device of verifying Lenz law, it comprises non-magnetic and can produce faradic metal tube 1, its length is 326mm, diameter is 17mm, its pipe thickness is 1mm, can adopt copper tube or aluminum to make, the side of non-magnetic metal tube 1 is provided with elongated view window 2, and the length of view window is 227mm, width is 6mm, be arranged with size consistent magnet steel 3 and iron core 4 on the non-magnetic metal tube 1, the up and down two ends of magnet steel 3 and iron core 4 respectively are provided with yellow Rubber end 5, and the diameter of Rubber end 5 is 12.7mm, wherein the length of magnet steel 3 and iron core 4 all is 19mm respectively, and their volume equates.The upper and lower side of non-magnetic metal tube 1 is provided with pink colour end cover rubber 6 and is fixed, and its diameter is 21mm.End cover rubber 6 directly eye-splice also can be the upper and lower side that is connected by screw at metal tube 1 at the upper and lower side of non-magnetic metal tube 1.

The use principle of Lenz law demonstrator is: the magnet 3 and the iron core 4 that are stained with Rubber end are living in profile and volume, if according to acceleration of gravity 9.8m/s ², the time that two objects descend by metal tube 1 time should be the same.Non-magnetic metal tube 1 is magnetic conduction product not.But be actually, by can observing fast that iron core 4 glides on the elongated view window 2 on the non-magnetic metal tube 1, and that magnet steel 3 glides is slow.Its main cause is exactly when magnet steel 3 glides, and is equivalent to sectioned coil in the non-magnetic metal tube 1 and produces induction current, follows according to Lenz law, has produced a magnetic field opposite with magnet steel 3 direction of motion.Therefore hindered the decline of magnet steel 3.(gap of magnet steel 3 and non-magnetic metal tube 1 is smaller during design, about 2mm, the magnetic field that produces like this is relatively obvious)

The utility model discloses the best case study on implementation of Lenz law demonstrator, can not be interpreted as the restriction to the utility model protection domain, every employing is equal to or similar technological means replaces to realize to rotate, all within protection domain of the present utility model.

Claims

1. demonstration device of verifying Lenz law, it comprises non-magnetic and can produce faradic metal tube, the side is provided with elongated view window, it is characterized in that: be provided with the consistent magnet steel of size and iron core in the metal tube, the upper and lower side of metal tube is provided with end cover rubber and is fixed.

2. demonstration device according to claim 1, it is characterized in that: the upper and lower side of magnet steel and iron core all is stained with Rubber end.

3. demonstration device according to claim 1 is characterized in that: the direct eye-splice of end cap is at the two ends of metal tube, or is connected by screw on the two ends that are fixed on metal tube.