Analysis demonstration instrument for Lenz law and Faraday law of electromagnetic induction

Abstract

The invention discloses an analysis demonstration instrument for Lenz law and Faraday law of electromagnetic induction. The analysis demonstration instrument comprises a bottom plate (5). A horizontal organic glass tube (10) is installed on the bottom plate. An electromagnetic induction coil (12) with a plurality of taps is fixed outside the tube. A circular magnet box (14) capable of freely sliding is arranged in the tube. Cylindrical magnets of different models are arranged in the box. A direct-current speed regulation motor (13) is arranged on the bottom plate and is placed on the rear side of the organic glass tube. A traction rope (11) is wound onto a motor shaft by one circle and then is connected with the magnet box through four fixed pulleys. One path of the electromagnetic induction coil (12) with the plurality of taps is connected with a measurement binding post, and the other path of the electromagnetic induction coil (12) with the plurality of taps is connected with a set of light emitting diodes which are connected in the anti-parallel manner. A voltage sensor is connected with the plurality of taps of the measurement binding post, and the voltage sensor is connected with a data processing device. According to the analysis demonstration instrument, the Lenz law and the Faraday law of electromagnetic induction can be demonstrated vividly and reliably, and students can easily understand the above laws.

Description

technical field [0001] The invention generally relates to a physical experiment device, in particular to an experimental device for quantitatively exploring and demonstrating Lenz's law and Faraday's law of electromagnetic induction. Background technique [0002] Electricity is a very important part of middle school physics, and Lenz's law and Faraday's law of electromagnetic induction are two very important laws of electricity in the part of middle school physics and electricity. The content of Lenz's law is: the induced current in a closed loop The direction always makes the magnetic field excited by it hinder the change of the magnetic flux that causes the induced current; the content of Faraday's electromagnetic induction is: when the magnetic flux of the loop changes, the magnitude of the induced electromotive force in the loop is proportional to the rate of change of the magnetic flux passing through the loop Proportional, that is, e=ΔΦ / Δt, if it is a multi-turn coil, ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing Faraday's law of electromagnetic induction that cannot demonstrate well and accurately quantitatively explore and analyze, and can only perform qualitative or semi-quantitative analysis, and provide a quantitative analysis and demonstration device for Faraday's law of electromagnetic induction. Lenz's law can be analyzed and demonstrated, the device can not only perform better demonstration but also complete quantitative analysis and inquiry

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