Geomagnetism self-counteracting ampere rule demonstration device

Abstract

The invention relates to an ampere formula experimental instrument, comprising a rotatable magnetic needle coupling, a supporting plate and a device. The device provides vertical straight line current. Same small magnetic needles (1 and 1') are paralleled with each other, while pointing of poles N are opposite and are arranged vertically on two ends of a long shaft (2), the magnetic needle coupling is formed by arranging top needles (3and 3') on the two ends of the long shaft (2), gravity centers of the long shaft (2) and the small magnetic needles (1 and 1') and the top needles (3and 3') are all arranged on an axial line (4). The rotatable magnetic needle coupling is formed by installing the magnetic needle coupling on a bracket (6) with bearings (5and 5'). The rotatable magnetic needle coupling is arranged on the horizontal supporting plate (9), the axial line (4) and a current carrying vertical straight conducting wire (8) are crossed vertically on a center of the magnetic needle coupling, the poles N of the small magnetic needles (1) are turned to and stopped in the direction of a magnetic field of current I, which is direct representation of the ampere formula. The direction of thumb finger of the right hand which holds the conducting wire (8) is the direction of current I , and the direction of four bended fingers is the encircling direction of a magnetic induction line (12).

Description

technical field [0001] The invention relates to an experimental instrument for middle school physics Ampere's law. Background technique [0002] The demonstration experiment used in the teaching of Ampere's law in middle school physics has always been the Oersted experiment that cannot directly show Ampere's law. [0003] Publication No. is CN1462987A " earth magnetic interference avoidance single straight wire ammeter " and publication No. are CN101145295A " demagnetization is to the method of the interference of the experiment of Ampere's law and the instrument that adopts this method " though can directly Ampere's law and The scene and law of the spatial distribution of the magnetic field of the linear current are displayed together, but their structure is more complicated and the experiment can only be done after some adjustments to the instrument. Contents of the invention [0004] The present invention is to solve the problem that the geomagnetic field interferes wi...

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Problems solved by technology

[0003] Publication No. is CN1462987A " earth magnetic interference avoidance single straight wire ammeter " and publication No. are CN101145295A " demagnetization is to the method for the interference of the experiment of Ampere's law and the instrument that adopts this method " though can directly put Ampere's law and The scene and law of the spatial distribution of the magnetic field of the linear current are displayed together, but their structure is more complicated and the experiment can only be done after some adjustments to the instrument

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