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Worksheet_18 - Iowa State University
... turned on. The strength of the magnetic field is 0.050 T, and it is directed into the paper. (a) Describe the path of the electron after the field has been turned on (assuming only magnetic effects). (b) What is the magnetic flux through a cube drawn around the electron? ...
... turned on. The strength of the magnetic field is 0.050 T, and it is directed into the paper. (a) Describe the path of the electron after the field has been turned on (assuming only magnetic effects). (b) What is the magnetic flux through a cube drawn around the electron? ...
24-1 Magnets: permanent & temporary
... When there is an electric current in a coil wire, the field acts like a permanent magnet Electromagnet Strength of the field is proportional to the current in the coil Increasing ...
... When there is an electric current in a coil wire, the field acts like a permanent magnet Electromagnet Strength of the field is proportional to the current in the coil Increasing ...
How can you make the field stronger? Add more loops!!!
... 1. What are permanent magnets made of? Why can these materials become magnets? ...
... 1. What are permanent magnets made of? Why can these materials become magnets? ...
Quiz 11
... A conducting rod (black) in a magnetic field (orange) is moving with velocity (red) and the direction of the force the magnetic field exerts on the bar points towards a (pink). What direction is the electric field on the conducting rod? ...
... A conducting rod (black) in a magnetic field (orange) is moving with velocity (red) and the direction of the force the magnetic field exerts on the bar points towards a (pink). What direction is the electric field on the conducting rod? ...
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.