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Davidmb19
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What is the actual explanation for the last demonstration, for why the ring rises up?
Ahhhh! I should have known.Thank you.elegysix said:The aluminum foil rises because the induced current and magnetic field are in the same direction as the larger ring. This means they are attracted because their magnetic fields align. However, the resistance is high enough that it is not repulsed by the coil when it is on there alone.
Faraday's Law, also known as the law of electromagnetic induction, states that when a conductor is placed in a changing magnetic field, an electromotive force (EMF) is induced in the conductor. This means that a voltage is created in the conductor, which can cause a current to flow if the conductor forms a closed loop.
Lenz's Law is a consequence of Faraday's Law and states that the direction of the induced EMF is always such that it opposes the change that produced it. This means that the induced current will flow in a direction that creates a magnetic field that opposes the original change in the magnetic field.
Faraday's and Lenz's Law have numerous practical applications, including generators, transformers, electric motors, and induction cooktops. They are also essential principles in the study of electromagnetism and are used in the design of many electronic devices.
Faraday's and Lenz's Law are closely related as Lenz's Law is a consequence of Faraday's Law. Both laws explain the phenomenon of electromagnetic induction, which is the creation of an EMF in a conductor due to a changing magnetic field. Lenz's Law is an extension of Faraday's Law, providing information about the direction of the induced EMF.
Some examples of Faraday's and Lenz's Law in action include the operation of generators, where mechanical energy is converted into electrical energy, and the operation of transformers, which are used to change the voltage of an AC current. Other examples include electromagnetic induction used in wireless charging and the functioning of electric motors in various household appliances.