Magnetism Study

Students below is the attached video link from our demonstration about magnetic field lines. View it and study the notes that are below it.

Key takeaways from the video:

“Faraday who realized that it’s a changing magnetic field that actually can generate electric current; so, as the magnet is falling through the pipe, it’s creating a changing magnetic field that generates little electric currents so called eddy currents in the pipe, and these create an opposing magnetic force on the magnet, slowing it down; so, it actually turns the pipe into an electromagnet, which pushes the magnet up, and this is what’s known as electromagnetic induction; so, causes the LED to light up, but it’s important that you the magnet moves quickly, because if you move it too slowly, the magnetic field is not changing fast enough to generate enough voltage to light this LED. This is actually the way all electricity is generated. You move a magnet near a conductor, and it creates an electric current. But where is this electrical energy coming from? You can’t get energy for nothing. Faraday realized that there must be a force pushing back on the magnet; it’s the same force that slows this magnet down, as it falls through the pipe; so, there’s actually energy being converted from gravitational potential energy into electrical energy and eventually heat energy; so, this pipe is warming up by taking some of the energy out of the falling magnet that these currents coming around; this way will induce a magnetic field, pushing in the opposite direction.”