Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download DEVICE TOPIC THEORETICAL Lenz’s Law Demonstration
Document related concepts
Maxwell's equations wikipedia , lookup
Alternating current wikipedia , lookup
Neutron magnetic moment wikipedia , lookup
Induction heater wikipedia , lookup
Magnetic nanoparticles wikipedia , lookup
Friction-plate electromagnetic couplings wikipedia , lookup
Electromagnetism wikipedia , lookup
Magnetic monopole wikipedia , lookup
Electrical resistance and conductance wikipedia , lookup
Electricity wikipedia , lookup
History of electromagnetic theory wikipedia , lookup
Magnetic field wikipedia , lookup
Magnetoreception wikipedia , lookup
Hall effect wikipedia , lookup
Superconductivity wikipedia , lookup
Multiferroics wikipedia , lookup
Electric machine wikipedia , lookup
Lorentz force wikipedia , lookup
Magnetohydrodynamics wikipedia , lookup
History of electrochemistry wikipedia , lookup
Magnetochemistry wikipedia , lookup
Galvanometer wikipedia , lookup
Scanning SQUID microscope wikipedia , lookup
Electromotive force wikipedia , lookup
History of geomagnetism wikipedia , lookup
Force between magnets wikipedia , lookup
Eddy current wikipedia , lookup
Transcript
DEVICE Lenz’s Law Demonstration TOPIC Electricity and Magnetism THEORETICAL BACKGROUND Faraday’s Law of induction states that an electric current can be produced by a changing magnetic field. The direction of the induced emf and induced current is determined from Lenz’s Law which states that the polarity of the induced emf is such that it tends to produce a current that will create a magnetic flux to oppose the change in the magnetic flux through a loop. For this demonstration to work effectively, a magnet is dropped inside of a long metallic pipe. As the magnet falls through the pipe, a current is induced in the pipe. This current in turn produces its own magnetic field which opposes the motion of the magnet. The magnet continues to fall, or at least is not repelled upward through the pipe, due to gravitational forces. DESCRIPTION The demonstration makes use of an aluminum tube, a copper tube, a piece of PVC pipe, and one or two button magnets. PROCEDURE 1. Obtain the necessary equipment and drop the button magnets through the pipes. 2. Why does the magnet tend to rotate about itself as it falls through the copper tube? SUGGESTIONS
