2013年8月5日星期一

magnetic force lines how the distribution


The magnetic field direction and the magnetic field lines
【Objective and requirements]
  Recognizing the direction of the magnetic field is the magnetic field direction magnetic field lines can be represented graphically.
】 【Instruments and equipment
  Bar magnet (T054), a horseshoe magnet (U082), a small needle (J2406-type), the projector slide projector, glass, cube magnets wax paper, iron certain.
[Experimental]
  1. Direction of the field
  According to Figure 3.23-1, in the same position and replace it with a different pointer Arctic observing needle pointing unchanged.
  Conclusion: The magnetic field direction of the needle in a position pointing to the North Pole field direction to that point.
 2. Magnetic flux distribution of a bar magnet

  The iron filings sprinkled around a bar magnet, tap the glass, and guide students to observe the arrangement of iron filings, as shown in Figure 3.23-2. Pointed out that the arrangement of iron filings are available to represent the magnetic field lines; magnetic field lines come out from the back magnet magnet Arctic Antarctic.
 3. Horseshoe magnet magnetic flux distribution in the same method to demonstrate a horseshoe magnet magnetic flux distribution shown in Figure 3.23-3.
Conclusion: The magnetic field lines are used to visually represent the magnetic field direction at each point of the curve.

[Reference] fixed magnetic line spectrum

  The permanent magnet on the table, the glass on the magnet above the glass and then covered with a wax paper, evenly sprinkle the filings on the waxed paper, tap the glass, so that iron filings lined up along the magnetic field lines. Then heated with an alcohol lamp on the glass when heated to make the alcohol lamp flame smaller, and make alcohol lamp beneath the glass moved slowly until melted wax on wax paper lit up. After the wax cools and solidifies, iron will stick to the wax paper, and put on wax paper fixed on a board hung up, you can see the spectrum of the magnetic field lines.

Note: when subjected to the magnetic field attached to the magnetic field of magnetic materials, the magnetic substances of refuse, the shape of the magnetic field lines will change.

没有评论:

发表评论