Tuning fork for observing electromagnetic phenomenon

Abstract

The tuning fork for observing the electromagnetic phenomenon comprises a tuning fork body, an assembly, a magnet and a coil, the tuning fork body comprises a fork handle and two vibration arms connected with the fork handle, the front ends of the vibration arms are fixedly connected with the fork handle, and the tail ends of the vibration arms are provided with first grooves used for inserting the assembly. A second groove for inserting the magnet is formed in the top of the assembly; and a coil surrounding the magnet is fixed on the outer side of the assembly. According to the tuning fork for observing the electromagnetic phenomenon, the vibrating arm of the tuning fork can be provided with a magnet and a coil and can also be provided with an assembly with the magnet and the coil, and the installation mode is simple and easy to operate; by knocking the tuning fork, the action principle of the electromagnetic field can be found according to the vibration time and the spectrogram of the tuning fork and the current intensity, and is intuitive and easy to understand; a magnetic field and an electric field having the same vibration frequency as the tuning fork can be provided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tuning fork, especially a tuning fork for observing electromagnetic phenomenon. BACKGROUND

[0002] The tuning fork is a kind of experimental equipment commonly used in physics, which is a steel or aluminum alloy sound generator in the shape of "Y", and can generate mechanical waves of single wavelength. Different tuning forks can emit pure tones of different wavelengths due to different sizes and lengths of prongs. The longer the prong, the higher the tuning fork, and the longer the wavelength, the lower the tone. The shorter the prong, the shorter the wavelength, and the higher the tone. In physics teaching, the tuning fork can be used to demonstrate the properties of mechanical waves. By tapping the tuning fork, the wave spectrum graph can be collected. It is found that: when the tuning fork is tapped lightly, the amplitude of the tuning fork is small, and the amplitude of the wave spectrum graph is small. At this time, the sound emitted by the tuning fork is also small. When the tuning fork is tapped heavily, the amplitude of the tuning fork is large, and the amplitude of the wave spectrum graph is large. At this time, the sound emitted by the tuning fork is also large. It shows that the loudness of mechanical waves is related to the amplitude of the mechanical waves of the tuning fork. The larger the amplitude, the louder the sound; the smaller the amplitude, the smaller the sound.

[0003] Magnetic field, a physical concept, refers to the field that transmits the magnetic force between objects. Magnetic field is composed of moving particles, which cannot be seen or touched under existing conditions. Magnetic field has the radiation characteristics of particles. There is a magnetic field around the magnet, and the interaction between magnets is mediated by the magnetic field, so the two magnets can act without physical contact.

[0004] The process of magnetic field change inducing electric field is actually an example of mutual conversion of electromagnetic field. When the intensity, direction or distribution of magnetic field changes, a non-static electric field, i.e. induced electric field, will be generated in the space around it. The direction of this electric field is perpendicular to the direction of the rate of change of the magnetic field, and satisfies the right-hand screw rule (the right-hand rule form of Faraday's law of electromagnetic induction). Therefore, the existence of induced electric field can be predicted and detected by observing the change of magnetic field.

[0005] Therefore, when demonstrating electromagnetic conversion, the interaction between the mechanical waves of the tuning fork can be observed. CONTENT OF THE UTILITY MODEL

[0006] The utility model provides a kind of tuning fork for observing electromagnetic phenomenon, solve the problem of using tuning fork to observe electromagnetic field phenomenon, its technical scheme is as follows:

[0007] A kind of tuning fork for observing electromagnetic phenomenon, including tuning fork body, component, magnet and coil, the tuning fork body includes prong handle and the two vibration arms connected with it, the front end of the vibration arm is fixedly connected with prong handle, and the distal end is provided with first recess for inserting component, the top of the component is provided with second recess for inserting magnet, and the coil is fixed around the magnet outside component.

[0008] The end of the vibrating arm is capable of inserting a magnet and fixing a coil around the magnet on the outside.

[0009] The side of the assembly is provided with a third groove for inserting a magnet, and the upper and lower sides of the third groove are provided with through holes for fixing the coil.

[0010] The side of the assembly is provided with a through hole for inserting a magnet, and the upper and lower sides of the through hole are provided with through holes for fixing the coil.

[0011] The shape of the first groove is circular or regular polygon, and the lower end cross section of the assembly corresponds to a circular or regular polygon.

[0012] The end side of the vibrating arm is provided with a groove or a through hole, and the upper and lower sides of the groove or the through hole are provided with through holes for fixing the coil.

[0013] The material of the assembly is the same as that of the vibrating arm.

[0014] The assembly includes an upper rod and a lower rod, and the cross section of the upper rod is the same as that of the vibrating arm.

[0015] The first groove is provided with an internal thread, and the lower rod is provided with an external thread, which is matched with the first groove through the thread.

[0016] The observation electromagnetic phenomenon tuning fork has better carrying and installation effects through the design of the detachable assembly structure, and has the following advantages: (1) the vibrating arm of the tuning fork can install a magnet and a coil, and can also install an assembly with a magnet and a coil, and the installation method is simple and easy to operate; (2) by knocking the tuning fork, the action principle of the electromagnetic field can be found according to the tuning fork vibration time and the wave spectrum diagram, and the current strength, which is intuitive and easy to understand; (3) a magnetic field and an electric field with the same vibration frequency as the tuning fork vibration frequency can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structure schematic view of the observation electromagnetic phenomenon tuning fork of embodiment one;

[0018] Figure 2 is a structure schematic view of the observation electromagnetic phenomenon tuning fork of embodiment two;

[0019] Figure 3 is a structure schematic view of the assembly of embodiment one;

[0020] Figure 4 is a structure schematic view of the assembly of embodiment two. DETAILED DESCRIPTION

[0021] As Figure 1As shown, the observation electromagnetic phenomenon tuning fork, including tuning fork body, component 3, magnet 4 and coil 5, the tuning fork body includes the handle 1 and two arms 2 connected with it, the front end of the arm 2 is fixedly connected with the handle 1, the end is provided with a first groove for inserting component 3, the top of the component 3 is provided with a second groove for inserting the magnet 4, the outer side of the component 3 is fixedly surrounded by the coil 5 of the magnet 4.

[0022] When the tuning fork is struck to vibrate, the two arms 2 of the tuning fork are in opposite vibration directions, that is, in a vibration state of approaching or moving away at the same time, therefore, the magnet 4 placed on the tuning fork can effectively observe the influence of the magnet 4 on the tuning fork, and the vibration amplitude of the tuning fork becomes larger or smaller according to the placement position and state of the magnet. On this basis, the coil 5 can be provided outside the magnet, the coil 5 is subjected to the change of the magnetic field formed by the magnet, and then generates current, the strength of the current is related to the vibration amplitude and the like.

[0023] Combination Figure 3 As shown, the component includes an upper rod 7 and a lower rod 8, the upper rod 7 has the same shape as the cross section of the arm, the upper rod 7 is provided with a second groove 9, and the material of the component is the same as that of the arm. Further, the first groove is circular or regular polygonal, and the lower end cross section of the component is circular or regular polygonal. When the component is connected, the component can also be inserted into the first groove in the form of screw thread cooperation, the first groove is provided with an internal thread, and the lower rod 8 is provided with an external thread, which is cooperated with the first groove through the thread.

[0024] In the first embodiment, the following experiments can be carried out:

[0025] Experiment 1: directly strike the tuning fork and observe the vibration state of the tuning fork;

[0026] Insert the ends of the two arms 2 into the magnet 4, strike the tuning fork and observe the vibration state of the tuning fork;

[0027] Adjust the N and S ends of the two magnets 4 to face outward, both N ends outward, both S ends outward, and one N end outward and the other S end outward, strike the tuning fork and observe the vibration state of the tuning fork;

[0028] The coil 5 can be fixed by the support frame (not shown) outside the component 3, one end of the support frame is fixed outside the component 3 by a U-shaped buckle, and the other end is fixed to the coil 5 by a clamp, and the support frame is made of plastic material.

[0029] The coil 5 is connected to an external measuring instrument such as a multimeter, and the current of the coil 5 is observed.

[0030] AsFigure 2 and Figure 4 As shown in the drawings, the side of the assembly is provided with a third groove or through hole for inserting a magnet, and the upper and lower sides of the third groove or through hole are provided with through holes for fixing the coil. Alternatively, the following method can be used: the end side of the vibrating arm is provided with a groove or through hole, and the upper and lower sides of the groove or through hole are provided with through holes for fixing the coil. The following experiments can be performed:

[0031] Experiment two: the ends of the two vibrating arms 2 are inserted into the assembly 3, and the tuning fork is struck to observe the vibration state of the tuning fork;

[0032] The through hole of the assembly 3 is inserted into the magnet 4, and the tuning fork is struck to observe the vibration state of the tuning fork;

[0033] The N end and the S end of the two magnets 4 are adjusted to face each other, and the coil 5 is fixed by the through holes, so that the tuning fork is struck to observe the vibration state of the tuning fork, and the current of the coil 5 is observed at the same time.

[0034] Further, a mass with the same mass as the magnet and the same material as the vibrating arm is also included, which can be installed in the third groove or through hole to replace the position of the magnet and increase the diversity of the experiment.

[0035] Under the guidance of the above experiments, the top of the assembly 3 can also be provided with a second groove, the side can be provided with a third groove or through hole, a horizontal coil can be installed on one of the vibrating arms, and a vertical coil can be installed on the other vibrating arm, and observation can be performed.

[0036] The tuning fork for observing electromagnetic phenomena has better carrying and installation effects through the design of the detachable assembly structure, and the utility model has the following advantages: (1) the vibrating arms of the tuning fork can be installed with magnets and coils, and the assembly with magnets and coils can also be installed, and the installation method is simple and easy to operate; (2) by striking the tuning fork, the action principle of the electromagnetic field can be found according to the vibration time and the wave spectrum diagram of the tuning fork, and the current strength, which is intuitive and easy to understand; (3) a magnetic field and an electric field with the same vibration frequency as the vibration frequency of the tuning fork can be provided.

Claims

1. A tuning fork for observing electromagnetic phenomena, characterized by: The tuning fork body includes a handle and two arms connected to the handle, the front end of the arms is fixedly connected to the handle, the end of the arms is provided with a first groove for inserting the assembly, the top of the assembly is provided with a second groove for inserting the magnet, and the outside of the assembly is fixedly provided with a coil surrounding the magnet.

2. The tuning fork for observing electromagnetic phenomena according to claim 1, characterized in that: The end of the arm can insert the magnet and is fixedly provided with a coil surrounding the magnet outside.

3. The tuning fork for observing electromagnetic phenomena according to claim 1, characterized in that: The side of the assembly is provided with a third groove for inserting the magnet, and the upper and lower sides of the third groove are provided with through holes for fixing the coil.

4. The tuning fork for observing electromagnetic phenomena according to claim 1, characterized in that: The side of the assembly is provided with a through hole for inserting the magnet, and the upper and lower sides of the through hole are provided with through holes for fixing the coil.

5. The tuning fork for observing electromagnetic phenomena according to claim 1, characterized in that: The shape of the first groove is circular or regular polygon, and the cross section of the lower end of the assembly corresponds to the circular or regular polygon.

6. The tuning fork for observing electromagnetic phenomena according to claim 1, characterized in that: The side of the end of the arm is provided with a groove or a through hole, and the upper and lower sides of the groove or the through hole are provided with through holes for fixing the coil.

7. The tuning fork for observing electromagnetic phenomena according to claim 1, characterized in that: The material of the assembly is the same as the material of the arm.

8. The tuning fork for observing electromagnetic phenomena according to claim 1, characterized in that: The assembly includes an upper rod and a lower rod, and the cross section of the upper rod is the same as the cross section of the arm.

9. The tuning fork for observing electromagnetic phenomena according to claim 8, characterized in that: The first groove is provided with an internal thread, and the lower rod is provided with an external thread, which is matched with the first groove through the thread.

Images