Method for geomagnet elimination interfering Ampere's rule experiment and instrument employing the method

Abstract

The present invention relates to a method for eliminating the interference of the horizontal branch magnetic field of the geomagnetic field into the ampere rule experiment and an ampere rule demonstrator using the method. The N and S poles of magnet plates (4, 5) of the instrument are arranged in the mutually opposite way, and the magnetic induction of the uniform magnetic field generated in a local space in the magnet plates and that of the horizontal branch magnetic field of the geomagnetic field are equal in intensity but opposite in directions, so the vector sum is zero and the free surfaces of the rotation of a viewer (14) and magnetic needles (9) in the local space are all horizontal. When current passes through a vertical straight wire (20) penetrating through the center of the local space, the N pole of each magnetic needle (9) rotates to and dwells in the direction of a magnetic field generated where the current is positioned. If the straightened thumb of a right hand holding the straight wire (20) points to the direction of the current, the direction that the four bent fingers point to is the encircling direction of magnetic induction lines (17). This is the experiment which can directly demonstrate the ampere rule with the elimination of the horizontal branch magnetic field of the geomagnetic field.

Description

technical field [0001] The invention relates to an experiment method of middle school physics Ampere's law and an instrument using the method. Background technique [0002] The demonstration experiment used in the teaching of Ampere's law in middle school physics has always been Oersted's experiment, but this practice is not ideal. The problem is that it does not show Ampere's law at all. This problem, Chinese Invention Patent Publication No. is CN1462987A, open date is on December 24th, 2003 " single straight lead ampere meter for avoiding geomagnetic interference " can solve, but this instrument has a shortcoming, when doing experiment, straight lead and The free surface of the small magnetic needle should be inclined at a large angle. For example, in Beijing where the geomagnetic inclination angle is 57°, it must be inclined at 33°, in Shanghai it must be inclined at 45°, and in Haikou it must be inclined at 67°. Inconvenience. Contents of the invention [0003] This ...

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Problems solved by technology

[0002] The demonstration experiment used in the teaching of Ampere's law in middle school physics has always been the Oersted experiment, but this practice is far from ideal. The problem is that it does not show Ampere's law at all.

This problem, Chinese Invention Patent Publication No. is CN1462987A, open date is on December 24th, 2003 " single straight lead ampere meter for avoiding geomagnetic interference " can solve, but this instrument has a shortcoming, when doing experiment, straight lead and The free surface of the small magnetic needle should be inclined at a large angle. For example, in Beijing where the geomagnetic inclination angle is 57°, it must be inclined at 33°, in Shanghai it must be inclined at 45°, and in Haikou it must be inclined at 67°. Inconvenience

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