CN2901475Y

CN2901475Y - Demonstrator for Lenz law

Info

Publication number: CN2901475Y
Application number: CN 200620033981
Authority: CN
Inventors: 刘文骅
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-04-25
Filing date: 2006-04-25
Publication date: 2007-05-16
Anticipated expiration: 2016-04-25

Abstract

The utility model provides a Lenz's law demonstration device comprising a transparent container, a strong magnet provided in the transparent container and two container caps respectively assembled with the two ends of the transparent container. Two supports with magnetic induction line direction marks are respectively provided between the strong magnet and the container caps of the two ends in the transparent container. A closed metal ring or a luminous ray jacket is provided on the transparent container and can reciprocally move along the transparent container. The utility model integrated with the magnetic induction phenomenon and the Lenz's law demonstration displays faradic current producing and faradic current orientation changing, which is characterized in more lively display, larger visual range and convenient demonstration for teachers` optional moving. The utility model realizes the zero-distance observation to the experimental device and phenomenon for pupils.

Description

The len's law demonstration device

Technical field:

The len's law demonstration device that faradic generation and direction thereof are judged in the utility model and the middle school physical curriculum electromagnetic induction phenomenon is relevant.

Background technology:

High school physics electromagnetic induction phenomenon, the used device of len's law demonstration are the circular arc coil, and Lenz law is also demonstrated with Lenz law demonstrator; Lenz law demonstrator mainly is fixed on the two ends formation of a bonding jumper by two beckets (closure, another opening), the concave groove at the center of gravity position of bonding jumper is supported by the thimble of support upper end, can rotate around thimble.Circular arc coil and Lenz law demonstrator are adapted at fixed position demonstration on the dais, and the close-ups effect is better.Shortcoming is that visible angle and visual range are limited, and the student who is sitting in both sides, classroom and back does not see; Its two, be not easy to teacher's demonstration of in the classroom, walking about, because circular arc coil and galvanometer are not only scattered but also heavy; The swing of Lenz law demonstrator demonstration when teacher walks about can causing aluminium ring causes the student to misread easily.

The utility model content:

The purpose of this utility model is in order to overcome the instrument heaviness, the complexity that exist with device demonstrating electromagnetic induction phenomenon, Lenz laws such as existing circular arc coils, to move shortcomings such as demonstration inconvenience, visible angle and visual range be less, a kind of magnetic induction phenomenon, len's law demonstration of integrating is provided, show the variation of faradic generation and direction, show more lively, visual range is bigger, make things convenient for teacher's demonstration of arbitrarily walking about, realize the len's law demonstration device that the student observes the zero distance of experimental provision and phenomenon.

The purpose of this utility model is achieved like this:

The utility model len's law demonstration device comprises transparent vessel, be arranged in the kicker magnet of transparent vessel, equipped with the transparent vessel two ends respectively container cover, the support of mark magnetic induction line direction is arranged respectively between kicker magnet and two ends container cover in transparent vessel, closed becket or isolychn are wrapped on the transparent vessel and can move back and forth along transparent vessel, the speed that falls that is wrapped on the transparent vessel that magnet is housed with closed becket or isolychn changes, represent the inhibition of faradic magnetic field to former magnetic field, effectively having overcome former Lenz law demonstrator can only horizontal positioned, drawback such as is afraid of to rock.

Above-mentioned transparent vessel, kicker magnet shape are respectively right cylinder, also can be other shape.

Above-mentioned isolychn bag is a light-emitting diodes pipeline bag.

In the above-mentioned light-emitting diodes pipeline bag coil is arranged, the different light emitting diode of two groups of glow colors respectively with the coil reverse parallel connection, with the different faradic generation of diode displaying of color and the variation of direction, show more vividly, visual range is bigger.

Alternate being evenly arranged on the same circumference of coil outside surface of light emitting diode that glow color in two groups of above-mentioned light emitting diodes is different.

Compare with existing Lenz law demonstrator, the utlity model has following effect:

(1) particularly show the variation of faradic generation and direction with closed becket with luminous form, more lively, directly perceived than showing, visual range is bigger with galvanometer;

(2) with transparent container fixed magnets, and allow closed becket or line bag with respect to vertical or tilted-putted magnet movement, overcome original apparatus for demonstrating presentation space, scope and visual range limitation and can not walking about property, make things convenient for the demonstration of arbitrarily walking about of teacher's hand-held device, realize that really the student observes the zero distance of experimental provision and phenomenon.

Description of drawings:

Fig. 1 is the utility model structural representation.

Fig. 2 is a light-emitting diodes pipeline pack arrangement synoptic diagram among Fig. 1.

Fig. 3 is coil and light emitting diode elementary diagram.

Fig. 4 is another structural representation of the utility model.

Fig. 5 cooperates synoptic diagram for opening aluminium ring with the glass tube that kicker magnet is housed.

Embodiment:

Embodiment 1:

Fig. 1～Fig. 3 has provided present embodiment 1 together.Referring to Fig. 1～Fig. 3, at external diameter is glass tube 1 central authorities of the 35mm both ends open cylindrical kicker magnets 2 that ndfeb magnetic material makes of packing into, insert the organic glass support chip 4 that indicates magnetic induction line 3 directions from the glass tube two ends, use lid 5 and bonding agent again the sealing of glass tube two ends.Light-emitting diodes pipeline bag 6 as shown in Figure 2, being connected in parallel on coil 8 two ends by 15 high brightness LEDs 7 forms, wherein red diode is eight, seven of blue diodes, arrange along same circumference at the coil outside surface, the positive and negative electrode of red diode is connected with the negative, positive utmost point of blue diode respectively as shown in Figure 3.The enameled wire of coil 8 usefulness φ 0.25mm twines 700 circles and makes on the coil rack of internal diameter φ 40mm, external diameter φ 65mm, wide φ 15mm.Hold glass tube when demonstrator's left hand as shown in Figure 1 and erect placement, when the right hand falls from the upper end of glass tube by light-emitting diodes pipeline bag, the speed that can observe line bag whereabouts is slow earlier (when entering magnetic field, the magnetic flux increase), the back is fast (after entering magnetic field, magnetic flux is almost constant), slow (when leaving magnetic field, magnetic flux reduces) again.Simultaneously, the speed that corresponding line bag falls, the luminous situation of diode successively is: the led lighting of a certain color (being made as redness) (illustrate that induction current is a certain direction), led lightings of not luminous (illustrate and do not produce induction current), another kind of color (blueness) (illustrating that faradic direction was with originally opposite).Change the degree of tilt of glass tube, can adjust the time that the line bag falls, be convenient to observation of students; When coil disconnected, the line bag was done the movement of falling object or uniformly accelerated motion downwards, and only produce induction electromotive force this moment, and diode is all not luminous.

Embodiment 2:

Fig. 4 has provided present embodiment 2 figure.Present embodiment 2 basic and embodiment 1 figure, not existing together is to replace light-emitting diodes pipeline bag with closed aluminium ring 9.As shown in Figure 4, hold glass tube when demonstrator's left hand and erect to place, the right hand allows closed aluminium ring when the upper end of glass tube falls, can observe speed that closed aluminium ring falls and be slow earlier, after soon, slow again.

As shown in Figure 5, cooperate with transparent glass tube with opening aluminium ring 10, opening aluminium ring falls do the movement of falling object from the glass tube upper end.

Claims

1, len's law demonstration device, it is characterized in that comprising transparent vessel, be arranged in the kicker magnet of transparent vessel, equipped with the transparent vessel two ends respectively container cover, the support of mark magnetic induction line direction is arranged respectively between kicker magnet and two ends container cover in transparent vessel, and closed becket or isolychn are wrapped on the transparent vessel and can move back and forth along transparent vessel.

2, len's law demonstration device as claimed in claim 1 is characterized in that transparent vessel, kicker magnet shape are respectively right cylinder.

3, len's law demonstration device as claimed in claim 1 or 2 is characterized in that the isolychn bag is a light-emitting diodes pipeline bag.

4, len's law demonstration device as claimed in claim 3 is characterized in that in the light-emitting diodes pipeline bag coil being arranged, the different light emitting diode of two groups of glow colors respectively with the coil reverse parallel connection.

5, len's law demonstration device as claimed in claim 4 is characterized in that two groups of alternate being evenly arranged on the same circumference of coil outside surface of light emitting diode that the glow color in the light emitting diode is different.