8J Magnets and electromagnets
... A wire carrying an electric current also shows magnetic field lines around it. They obey the same rules as magnetic fields. The closer the lines are together the stronger the force. But does this attract or repel a magnet? That depends on which way the current is flowing. ...
... A wire carrying an electric current also shows magnetic field lines around it. They obey the same rules as magnetic fields. The closer the lines are together the stronger the force. But does this attract or repel a magnet? That depends on which way the current is flowing. ...
Ch 36-37 Magnetism & EMI
... Even in a broken magnet, there is N and S. A small compass in a magnetic field will line up parallel with the magnetic field lines. Magnetic domains are regions of aligned atoms. Magnets can attract unmagnetized objects by temporarily producing magnetism in the object. Magnetic fields are always pro ...
... Even in a broken magnet, there is N and S. A small compass in a magnetic field will line up parallel with the magnetic field lines. Magnetic domains are regions of aligned atoms. Magnets can attract unmagnetized objects by temporarily producing magnetism in the object. Magnetic fields are always pro ...
Electromagnetic Induction Lab
... In 1831, Michael Faraday - after many experiments - discovered that he could create a current in a wire by moving it through a magnetic field. In principle, he determined that whenever the magnetic field was changing perpendicular to a conductor that a current was induced. His discovery eventually l ...
... In 1831, Michael Faraday - after many experiments - discovered that he could create a current in a wire by moving it through a magnetic field. In principle, he determined that whenever the magnetic field was changing perpendicular to a conductor that a current was induced. His discovery eventually l ...
Course Review
... it is said to be lossy. Lossy lines no longer exhibit undistorted propagation; hence a rectangular pulse launched on such a line will not remain rectangular, instead evolving into irregular, messy shapes. However, sinusoidal waves, because of their unique mathematical properties, do continue to be s ...
... it is said to be lossy. Lossy lines no longer exhibit undistorted propagation; hence a rectangular pulse launched on such a line will not remain rectangular, instead evolving into irregular, messy shapes. However, sinusoidal waves, because of their unique mathematical properties, do continue to be s ...
Document
... The following is excerpted from a webpage available at the University of Kentucky: http://www.chem.uky.edu/courses/common/plagiarism.html This is one of the most common mistakes that students make. You can not simply reword a sentence. This is best shown by example. Consider the following sentence ...
... The following is excerpted from a webpage available at the University of Kentucky: http://www.chem.uky.edu/courses/common/plagiarism.html This is one of the most common mistakes that students make. You can not simply reword a sentence. This is best shown by example. Consider the following sentence ...
MAGNETIC FIELD OF A SOLENOID Inside
... true only near the centre of the solenoid where the field lines are parallel to its length, is important inasmuch as it shows that the field outside is practically zero since the radii of the field outside the solenoid will tend to infinity. An intuitive argument can also be used to show that the fi ...
... true only near the centre of the solenoid where the field lines are parallel to its length, is important inasmuch as it shows that the field outside is practically zero since the radii of the field outside the solenoid will tend to infinity. An intuitive argument can also be used to show that the fi ...
Electronic Magnetic Moments
... may correspond to a current in a loop of wire having no resistance where m=(area of loop) (current) •Note that the angular momentum is continuous (not quantized), indicating a classical treatment of the problem ...
... may correspond to a current in a loop of wire having no resistance where m=(area of loop) (current) •Note that the angular momentum is continuous (not quantized), indicating a classical treatment of the problem ...
Faraday`s Law and Induced Emf
... magnetic flux is given by ΦB = B⃗ ⋅ A⃗ = BA cos(θ) , where θ is the angle between the magnetic field B⃗ and the normal to the surface of area A. To find the direction of the induced emf, one can use Lenz's law: The induced current's magnetic field opposes the change in the magnetic flux that induce ...
... magnetic flux is given by ΦB = B⃗ ⋅ A⃗ = BA cos(θ) , where θ is the angle between the magnetic field B⃗ and the normal to the surface of area A. To find the direction of the induced emf, one can use Lenz's law: The induced current's magnetic field opposes the change in the magnetic flux that induce ...
Electromagnet
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.