CN201725469U

CN201725469U - Experimental apparatus for faraday law of electromagnetic induction

Info

Publication number: CN201725469U
Application number: CN201020126456XU
Authority: CN
Inventors: 王占军
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-02-03
Filing date: 2010-02-03
Publication date: 2011-01-26
Anticipated expiration: 2020-02-03

Abstract

An experimental apparatus for faraday law of electromagnetic induction is characterized in that the experimental apparatus is provided with an upper hanging top (2) arranged at the upper part, one or more than one hanging rope hung at two ends of the upper hanging top (2), a sloshing plate (3) positioned below the upper hanging top (2) and having two ends respectively hung below the hanging ropes (1), and one or more than one coil (4) fixed on the sloshing plate (3). The utility model ensures that the faraday law of electromagnetic induction can be taught more effectively, the experimental apparatus simple, the manufacturing cost is low, experimental phenomena are obvious, the speed of movement can be controlled by using the isochronism of simple pendulum, the experimental apparatus facilitates the operation and explanation of a teacher, the principle is clear, and students can observe and comprehend easily.

Description

A kind of Faraday's electromagnetic induction law experimental provision

One. technical field

The utility model belongs to the teaching aid technical field, particularly relates to Faraday's electromagnetic induction law confirmatory experiment Design of device and manufacturing.

Two. background technology

Faraday's electromagnetic induction law is a very important law in physics.Understanding this law the teaching middle school student has certain difficulty, and this is because this law theoretical explanation and the derivation of equation are fairly simple, but experiment is not easy to do.Do not have corresponding experimental provision to see experimental phenomena intuitively at present, just can not allow the student verify this law by experiment yet, thereby deepen understanding and memory law.So teaching employee of the teaching methods law of electromagnetic induction, wishing has a kind of Faraday's electromagnetic induction law experimental provision to carry out more fruitful professor's Faraday's electromagnetic induction law, but regrettably up to this point, still there is not this Faraday's electromagnetic induction law experimental provision selling on the market.

Three. summary of the invention

The purpose of this utility model is to manufacture and design a kind of Faraday's electromagnetic induction law experimental provision, so that make the teaching employee of the teaching methods law of electromagnetic induction, and can more fruitful professor's Faraday's electromagnetic induction law.

The purpose of this utility model is achieved in that a kind of Faraday's electromagnetic induction law experimental provision, it is characterized in that: have be arranged at the top go up to hang top 2, be hung on 2 two ends, top the extension rope 1 more than one or, be in that extension pushes up 2 belows and two ends are hung in swinging plate 3, be fixed in the one or more coil 4 that swings on the plate 3 under the extension rope 1.Last extension top 2 is tabular or shaft-like or palisade.Hanging rope 1 is cotton thread or plastic cord or metal wire.Last extension top 2 is plank or plastic plate or sheet metal.Coil 4 is trapezoidal oval or the circular or polygon of rectangle.

Take the utility model of above measure, more fruitful professor's Faraday's electromagnetic induction law, device is simple, cheap, experimental phenomena is obvious, utilizes the tautochronism controlled motion speed of single pendulum, be convenient to teacher's operation and explanation, principle is clear, and the student observes easily and understands.

Below in conjunction with the accompanying drawings and embodiments the utility model is described in further detail again.

Four. description of drawings

Accompanying drawing 1 is the structural representation of the utility model (embodiment);

Accompanying drawing 2 is use schematic views of the utility model (embodiment).

Five. embodiment

The utility model is a kind of Faraday's electromagnetic induction law experimental provision, have be arranged at the top go up to hang top 2, be hung on 2 two ends, top the extension rope 1 more than one or, be in that extension pushes up 2 belows and two ends are hung in swinging plate 3, be fixed in the one or more coil 4 that swings on the plate 3 under the extension rope 1.Last extension top 2 is tabular or shaft-like or palisade.Hanging rope 1 is cotton thread or plastic cord or metal wire.Last extension top 2 is plank or plastic plate or sheet metal.Coil 4 is trapezoidal oval or the circular or polygon of rectangle.The utility model is similar to a swing, but what swing on the plate 3 carrying is not people but coil 4.

Accompanying drawing 1 has provided the structural representation of the utility model embodiment.Referring to accompanying drawing 1.The extension top 2 usefulness three-ply boards of going up of embodiment are made long 25 centimetres, wide 10 centimetres.Hang totally 4 on rope 1, be the cotton thread of 0.5 millimeter of diameter, long 28 centimetres.Swing plate 3 and also make, long 25 centimetres, wide 10 centimetres with three-ply board.4 extension ropes 1 pass the hole and the knotting of the corresponding position, 4 angles that hangs top 2 and swing plate 3 respectively, have so just become the device of a similar swing.Coil 4 is a rectangular wire frame, and is long 20 centimetres, wide 10 centimetres, forms around 200 circles with the enameled wire of 0.25 millimeter of diameter, is bundled into shaped as frame blended rubber water or immobilization with adhesive tape at the medium position that swings plate 3 with fine rule.Secondary coil 5 also is a rectangular wire frame, long 25 centimetres, wide 5 centimetres, enameled wire with 0.25 millimeter of diameter forms around 200 circles, also be bundled into shaped as frame blended rubber water or immobilization with adhesive tape at the medium position that swings plate 3 with fine rule, 5 liang of wire frame girths of coil 4 and secondary coil equate, and form around 200 circles with identical enameled wire, then all-in resistance separately equates.

The utility model is work like this: accompanying drawing 2 has provided the use schematic views of the utility model embodiment, referring to accompanying drawing 2.

To go up earlier to hang and push up on 2 iron clamps that are fixed on the experiment iron stand 6, be to be played by four isometric extension ropes 1 owing to swing plate 3, can freely swing, and is equivalent to single pendulum, has tautochronism during swing.Again the coil of student's power supply with electromagnet 7 linked to each other.

Experimental procedure is as follows:

1. sensitive galvanometer G at first is connected with coil 4, and student's power supply is opened at 2V direct current retaining, allows the coil 4 that swings on the plate 3 freely swing 2-3 time in the magnetic field of electromagnet, observes and write down the registration of sensitive galvanometer G indicator swing.

2. again student's power supply is reached 4V, allow the coil 4 that swings on the plate 3 in the magnetic field of electromagnet, freely swing 2-3 time again with the identical amplitude of oscillation for the first time, the registration of observed and recorded sensitive galvanometer G indicator swing, and with primary registration relatively, will see that secondary registration is twice than primary registration.This is that the electrorheological in the electromagnet is big because voltage raises in the physical sense, and then the magnetic field intensity B of electromagnet becomes big.According to formula E=BLV, it is big that B becomes, and then E also becomes big.

3. sensitive galvanometer G changes and does to be connected with coil 5, and supply voltage 4V is constant, with for the first time identical amplitude of oscillation swing 2-3 time, will see that at this moment the throw of the pointer that sensitive galvanometer G shows diminishes, registration be secondary half, identical with the first time.At this moment because coil 5 wide be 5 centimetres, be that coil 4 wide is half of 10 centimetres.According to formula E=BLV, L reduces, and then E also will reduce.

4. on the basis in the 3rd step, other conditions are constant, just increase pivot angle, allow lower plate swing 2-3 time in magnetic field, and the swing registration that will see the pointer of table compares for the third time bigger.

At this moment because pivot angle increases, pendulum length is constant, and the cycle of single pendulum is constant, and then the linear velocity of lower plate becomes big.According to formula E=BLV, V increases, and then E also increases.

Above experimental procedure has fully been verified the correctness of formula (2) E=BLV.

Claims

1. Faraday's electromagnetic induction law experimental provision is characterized in that: have the extension rope (1) more than one or that is arranged at going up of top and hangs top (2), be hung on two ends, top (2), be in extension and push up below (2) and two ends and be hung in swinging plate (3), be fixed in the one or more coil (4) that swings on the plate (3) under the extension rope (1).

2. Faraday's electromagnetic induction law experimental provision according to claim 1 is characterized by: going up and hanging top (2) is tabular or shaft-like or palisade.

3. Faraday's electromagnetic induction law experimental provision according to claim 1 is characterized by: hanging rope (1) is cotton thread or plastic cord or metal wire.

4. Faraday's electromagnetic induction law experimental provision according to claim 1 is characterized by: going up and hanging top (2) is plank or plastic plate or sheet metal.

5. Faraday's electromagnetic induction law experimental provision according to claim 1 is characterized by: coil (4) is trapezoidal oval or the circular or polygon of rectangle.