Do you know how many electromagnets exist? Or how much you make use of them in your life almost everyday? A countless number of electromagnets are developed in the world and their use makes life easier.
Electromagnets are the products of electromagnetism, which is known as the creation of a magnetic field through a flowing current. Anelectromagnet is an object that can be temporarily magnetized by the electric current that flows through the coil surrounding it. By coiling a current carrying conductor around an object, such as an iron or steel nail, the electric current magentizes the nail. When the electric current passes through the object, a magnetic field is produced and is concentrated in the object's core. The magnetic field that is produced is similar to a permanent magnet in which it causes the nail to become temporalily magnetized. The magnetic field from the nail allows the nail to have a north and south pole. This electricially charges the object and leaves it in a magnetized state. The magnetic nail is now able to repel or attract itself to other magnetic objects.
Direction
The strength of the magnetic field is proportional and parallel to the current in the coil. The image above represents by showing the green arrow, B, as the strength of the magnetic field by being parallel to the current in the coil. Simply by increasing the number of loops or coils on the object (nail), the strength of the magnetic field increases because the strength and current flow directly vary with each other. The more coils there are, the stronger the magnetic field is because the coils create a stronger and more concentrated magnetic field. To determine the direction of the magnetic field produced by the strength of the electromagnet and the current flow, you can use the second right hand rule. You must curl your fingers around the loops that are on the electromagnet which is in the direction of the current flow. Then your thumb will point toward the north pole of the electromagnet.
For more information on how to make an electromagnet check out the video at the bottom of the page!
A Interesting Experiment...
One way you can form a electromagnet is simply by having a battery, 2 wires, and an object such as an iron or steel nail. After connecting the clips of the wire to the batteries, wrap the body of wire around the object. Then try picking up small magnetic bits, sich as staples, and try picking some up with the magnetized nail.
Did the nail pick up the staples?
Yes
How did this happen?
When the electric current passes through the wire round around the nail, it creates a magnetic field.The magnetic field twists with the coiled wire, causing the magnetic field lines to concentrate inside the coil. If the coil is further from the object's core, then it will be less effective. However, as the magnetic field lines concentrate inside the coil, it creates a powerful magnetic effect, forming the nail to become an electromagnet. If we wanted a stronger electromagnet or stronger magnetic lines of force we can always wrap more coil around the objects core.
The Use of Electromagnets
Electromagnets help control the intensity of signals and is a method of sending messages.They can be used to create continual motion when opposed by other electromagnets or permanent magnets.
A few examples of the uses of electromagnets in everyday objects can be found in computer monitors and televisions. Computer monitors use electrons that are incredibly fast moving. The beams that come from these electrons create images on the screen. The electromagnets then alter the beams in order to create images that can be seen and enjoyed. The same process pretty much occurs in televisions as well. In this case phosphor dots glow and generate the picture. This happens because of the electron beam moving across the back of the screen. Electromagnets are then placed around a cathode ray tube to control how the beam moves, either up and down, or from side to side, once again creating an image.Examples of other uses of electromagnets include: telephones, washing machines, audio tapes, automobiles, lights, generators, motors, speakers, toasters, and a whole lot more.
What Are Electromagnets & How Are They Used?
Electromagnets
Do you know how many electromagnets exist? Or how much you make use of them in your life almost everyday? A countless number of electromagnets are developed in the world and their use makes life easier.
Electromagnets are the products of electromagnetism, which is known as the creation of a magnetic field through a flowing current. An electromagnet is an object that can be temporarily magnetized by the electric current that flows through the coil surrounding it. By coiling a current carrying conductor around an object, such as an iron or steel nail, the electric current magentizes the nail. When the electric current passes through the object, a magnetic field is produced and is concentrated in the object's core. The magnetic field that is produced is similar to a permanent magnet in which it causes the nail to become temporalily magnetized. The magnetic field from the nail allows the nail to have a north and south pole. This electricially charges the object and leaves it in a magnetized state. The magnetic nail is now able to repel or attract itself to other magnetic objects.
Direction
The strength of the magnetic field is proportional and parallel to the current in the coil. The image above represents by showing the green arrow, B, as the strength of the magnetic field by being parallel to the current in the coil. Simply by increasing the number of loops or coils on the object (nail), the strength of the magnetic field increases because the strength and current flow directly vary with each other. The more coils there are, the stronger the magnetic field is because the coils create a stronger and more concentrated magnetic field. To determine the direction of the magnetic field produced by the strength of the electromagnet and the current flow, you can use the second right hand rule. You must curl your fingers around the loops that are on the electromagnet which is in the direction of the current flow. Then your thumb will point toward the north pole of the electromagnet.
For more information on how to make an electromagnet check out the video at the bottom of the page!A Interesting Experiment...
One way you can form a electromagnet is simply by having a battery, 2 wires, and an object such as an iron or steel nail. After connecting the clips of the wire to the batteries, wrap the body of wire around the object. Then try picking up small magnetic bits, sich as staples, and try picking some up with the magnetized nail.
Did the nail pick up the staples?
YesHow did this happen?
When the electric current passes through the wire round around the nail, it creates a magnetic field.The magnetic field twists with the coiled wire, causing the magnetic field lines to concentrate inside the coil. If the coil is further from the object's core, then it will be less effective. However, as the magnetic field lines concentrate inside the coil, it creates a powerful magnetic effect, forming the nail to become an electromagnet. If we wanted a stronger electromagnet or stronger magnetic lines of force we can always wrap more coil around the objects core.The Use of Electromagnets
Electromagnets help control the intensity of signals and is a method of sending messages.They can be used to create continual motion when opposed by other electromagnets or permanent magnets.
A few examples of the uses of electromagnets in everyday objects can be found in computer monitors and televisions. Computer monitors use electrons that are incredibly fast moving. The beams that come from these electrons create images on the screen. The electromagnets then alter the beams in order to create images that can be seen and enjoyed. The same process pretty much occurs in televisions as well. In this case phosphor dots glow and generate the picture. This happens because of the electron beam moving across the back of the screen. Electromagnets are then placed around a cathode ray tube to control how the beam moves, either up and down, or from side to side, once again creating an image. Examples of other uses of electromagnets include: telephones, washing machines, audio tapes, automobiles, lights, generators, motors, speakers, toasters, and a whole lot more.
http://www.youtube.com/watch?v=ckSNA0MlcBE&feature=relmfu
Sources Used:
Chapter 24.1 from "Physics: Principles and Problems"
(http://www.ndt-ed.org/EducationResources/HighSchool/Electricity/electromagnetism.htm)
(http://education.jlab.org/qa/electromagnet.html)
(http://www.energyquest.ca.gov/projects/electromagnet.html)
(http://www.newworldencyclopedia.org/entry/Electromagnetism)
(http://www.ehow.co.uk/list_5908429_10-uses-electromagnet.html)
Images:
http://www.google.com/imgres?q=picture
http://www.google.com/imgres?q=telephone&um
http://www.google.com/search?hl=en&q=picture
http://www.google.com/search?hl=en&q=picture