Electromagnetic Induction: Solenoid & Magnet

In summary, Lenz's law states that the mechanical energy to overcome a magnetic field is converted to electrical energy.
  • #1
Kyoma
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0
I have just learned electromagnetic induction and it states that if you move a magnet through a solenoid, you would get an induced current.

Say, if you have a copper solenoid, and if you want to move a magnet through it, there will be something (maybe, a force) that would prevent the magnet from entering into the solenoid. Similarly, if you want to withdraw the magnet out of the solenoid, that 'something' would try to make the magnet stay in the solenoid.

According to Lenz's law, the mechanical energy to overcome that 'something' would be converted to electrical energy (the induced current).

So, what is that something?
 
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  • #2
It's a magnetic field. There's a sort of 'feedback' going on. The changing magnetic field induces a current (Faraday's law), and this current in turn induces a magnetic field opposing the change by Ampere's law. It is this induced magnetic field that opposes the motion of the magnet.
 
  • #3
Yes it will, it's called generator. It will give out electrical energy if you will use mechanical energy by rotating the coil, and will rotate by giving electrical energy, which is electrical motor. But it has to be done correctly to work so:

You must have coil in between of two magnets, so that it is in centre of the magnetic field.
There's really not much to tell about it, it just how universe is.
So if you will rotate said coil in magnetic field,(by not touching magnets)the work is done and it will give out energy equal to given energy, that is, will give out electrical energy if you apply mechanical. And works vice-versa for giving out mechanical energy if you apply electrical energy to wires.

hope that made things clear to you.
 
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  • #5


I can explain that "something" as the phenomenon of electromagnetic induction, which is the creation of an electric current in a conductor when it is exposed to a changing magnetic field. In this case, the changing magnetic field is caused by the movement of the magnet through the solenoid.

The force that prevents the magnet from entering or leaving the solenoid is due to the interaction between the magnetic field of the magnet and the changing magnetic field in the solenoid. This creates an opposing force, known as electromagnetic induction force, which resists the motion of the magnet. This force is proportional to the rate of change of the magnetic field and the number of turns in the solenoid.

This phenomenon is described by Faraday's law of induction, which states that the induced electromotive force (EMF) in a closed circuit is directly proportional to the rate of change of the magnetic flux through the circuit. This EMF then causes the flow of electrons, creating an induced current.

In summary, the "something" that resists the motion of the magnet and converts mechanical energy into electrical energy is the phenomenon of electromagnetic induction. It is a fundamental principle in electromagnetism and has many practical applications, such as in generators and transformers.
 

1. What is electromagnetic induction?

Electromagnetic induction is the process of generating an electric current in a conductor by placing it in a changing magnetic field. This is achieved by moving the conductor through the magnetic field or by changing the strength of the magnetic field.

2. How does a solenoid work?

A solenoid is a coil of wire that carries an electric current. When a current passes through the coil, it creates a magnetic field. This magnetic field can be used to attract or repel other magnets, or to induce a current in nearby conductors through electromagnetic induction.

3. How is a solenoid different from a magnet?

A solenoid is different from a magnet in that it only produces a magnetic field when an electric current is passing through it, whereas a magnet has a permanent magnetic field. Additionally, the magnetic field of a solenoid can be turned on and off by controlling the electric current, while a magnet's magnetic field is always present.

4. What are some practical applications of electromagnetic induction?

Electromagnetic induction has many practical applications such as generators, transformers, induction cooktops, and electric motors. It is also used in everyday devices such as headphones, speakers, and microphones.

5. How does electromagnetic induction relate to Faraday's Law?

Faraday's Law of Electromagnetic Induction states that the magnitude of the induced electromotive force (EMF) in a closed circuit is proportional to the rate of change of the magnetic flux through the circuit. This means that the faster the magnetic field changes, the greater the induced EMF will be.

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