![Interactions between Electricity and Magnetism](http://s1.studyres.com/store/data/008057610_1-693e8bcd34e8075b54339af1f0fd2ca0-300x300.png)
Presentations
... “I'm not sure I comprehend the drawing correctly, but I think the reaction would gravitate upward in reaction to the north pole of the magnet.” “since the loop is not moving there is no energy produced.” ...
... “I'm not sure I comprehend the drawing correctly, but I think the reaction would gravitate upward in reaction to the north pole of the magnet.” “since the loop is not moving there is no energy produced.” ...
Electromagnetism G. L. Pollack and D. R. Stump
... Magnetic Field of a Bar Magnet Everyone has played with magnets and felt the mystery of their forces. N and S poles attract; N poles repel and S poles repel. These forces come from the magnetic field B(x). What is the magnetic field of a bar magnet? Electric current is one basic source of B(x), but ...
... Magnetic Field of a Bar Magnet Everyone has played with magnets and felt the mystery of their forces. N and S poles attract; N poles repel and S poles repel. These forces come from the magnetic field B(x). What is the magnetic field of a bar magnet? Electric current is one basic source of B(x), but ...
Induction AP/IB
... • When an emf is generated by a change in magnetic flux according to Faraday's Law, the polarity of the induced emf is such that it produces a current whose magnetic field opposes the change which produces it. • The induced magnetic field inside any loop of wire always acts to keep the magnetic flux ...
... • When an emf is generated by a change in magnetic flux according to Faraday's Law, the polarity of the induced emf is such that it produces a current whose magnetic field opposes the change which produces it. • The induced magnetic field inside any loop of wire always acts to keep the magnetic flux ...
Physical Science Chapter 15 Exam
... 14. Device that produces a strong magnetic field when electricity passes through it 15. Object capable of attracting objects made of steel or iron 16. simple device that uses the laws of electrostatics to detect small electric charges 17. Device used to produce static electricity 18. the force betwe ...
... 14. Device that produces a strong magnetic field when electricity passes through it 15. Object capable of attracting objects made of steel or iron 16. simple device that uses the laws of electrostatics to detect small electric charges 17. Device used to produce static electricity 18. the force betwe ...
Electromagnet
![](https://commons.wikimedia.org/wiki/Special:FilePath/Simple_electromagnet2.gif?width=300)
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of a large number of closely spaced turns of wire that create the magnetic field. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.Electromagnets are widely used as components of other electrical devices, such as motors, generators, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.