Electromagnetic Induction: Solenoid & Magnet

[Kyoma]

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?

 

[henry_m]

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.

 

[Tryp]

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.

 

[Tryp]

I found awesome channel that explains all that stuff, you'd be better off listening to this guy than me -

http://www.youtube.com/watch?v=3BYXuYybaNg&feature=channel_video_title

There are many videos on his channel about different stuff.