How to observe magnetic fields and identify magnetic poles?

In general, the magnetic field of a strong magnet is invisible.This phenomenon also adds to the mystery of the magnet and stimulates curiosity.If you want to visualize the abstract magnetic field and identify the magnetic poles, you can use a few simple auxiliary tools.

1. Magnetic induction line demo board

There are vertical, horizontal, three-dimensional varieties, bar magnet, shoe magnet can be used to demonstrate the formation of the surrounding magnetic induction line and magnetic poles in different cases of attraction or repulsion.It can also demonstrate the formation of magnetic sensing lines in various Spaces around the current magnetic field.Generally made of plexiglass, novel and beautiful, the effect is obvious, intuitive and can be projected.

Usage:

A. First shake the presentation board gently to make the small needles or needles in the holes irregularly arranged, and then put the magnet on the presentation board and tap the surface of the board to make the small needles or needles in the holes appear clearly under the action of the magnetic field.

B. When teaching current magnetic field, switch on 6-9 power sources, and the original needle pieces or small needles in the holes with irregular arrangement appear magnetic induction lines obviously.The same effect is obtained by changing the direction of the current, and a magnetic field is concluded to exist around the current conductor.

2. The magnetic card

It is also a simple and reliable device for detecting magnetic field.The unique film levitates tiny particles of nickel on a thin layer of sticky material, keeping them in line with the magnetic field.It shows the position of the magnets and the number of poles.Simply place the video card on top of the magnet, and the poles will appear dark.The light green area is the magnetic field.Magnetic graphics CARDS help us determine the exact location of magnetic poles, the number of poles in a magnet, and the ease with which "hidden" magnetic fields can be found.

3.Magnetic pole detector

Although the magnetic observer CARDS show the position of the magnetic poles, they do not classify them.If determining the north or South Pole of a magnet is important, the tool used is the pole detector.Finding a magnetic pole using a pole finder is very simple.Just pull out the magnet that you need to detect., touch the top tip of the magnetic pole detector to the surface of the magnet, and the corresponding LED light of S or N will light up.On the contrary, it is the N pole of the magnet. With the popularization and popularization of scientific application equipment, magnetic graphics card and magnetic pole detector have become common tools for the daily magnetic pole detection of science and technology enthusiasts.As shown in the figure below:

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