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Magnetism
Magnetism is simply an abstraction that people use for the changes in electromagnetic force created by the motion of electric charges. There are different types of magnetism that include electromagnetism, ferromagnetism, paramagnetism, and diamagnetism. To learn more and share your knowledge of magnetism and its types, ask and answer questions here.
4,020 Questions
Where is a bar magnet's pull strongest?
A bar magnet is strongest at its ends, or poles. This is because there is a magnetic field, or B field, that is produced by the magnet itself. The magnetic field can be represented by magnetic field lines, which enter one end of the magnet and exit the other.
For instance, in a bar magnet, the magnetic field lines emerge from the north pole of the magnet and enter the magnet at the south pole. Since a magnet has two poles, it is said to be a magnetic dipole.
The magnetic field lines are most closely packed together at the poles, since it is a short distance to the opposite pole of the magnet. This is why a bar magnet is most effective at short distances. Picking up a paperclip from a centimeter or two away is much easier than trying to magnetically attract a paperclip to a magnet from a distance greater than five or six centimeters.
What does it mean by steel is magnetically hard?
A magnetically hard substance is one which can be permanently magnetised using a strong magnetic force. Steel is one such substance. (A magnetically soft substance can only be magnetised temporarily.)
How much poles does a magnetic bar have?
A magnetic bar has two poles: a North pole and a South pole.
The Earth's magnetic north pole is a point at the top of the northern hemisphere where the magnetic pull is straight down, toward the Earth's core. It is not the same as the Earth's geographic north pole. The geographic north pole is fixed at geodetic latitude 90° North. However, the magnetic north pole drifts, based on magnetic changes to the Earth's core. Some scientists think it is drifting toward Siberia 34-37 miles (55-60 km) per year, and can vary from day-to-day up to 50 miles (80 km) per day, because of the Earth's elliptical movement.
Here are some measurements of the location of the Earth's magnetic pole:
In 1831 = 70°5.3'N 96°46.0'W
In 1904 = 70°31'N 96°34'W
In 1930 = 72.3°N 98.7°W
In 1994 = 78.3°N 104.0°W?
In 2001 = 81.3°N 110.8°W?
In 2005 = 82.7°N 114.4°W?
In 2007 = 83.95°N 120.72°W
In 2010 = 85.0°N 132.6°W
In 2011 = 85.1°N 134.0°W
The pole wanders daily in a roughly elliptical path around this average position, and may frequently be as much as 80 kilometers away from this position when the Earth's magnetic field is disturbed.
What is clustered region of aligned magnetic atoms called?
Technically impossible . In a rock , ferromagnetism can create poles , but not in atoms .
Atoms cannot be magnetic . Molecules can be polar , which leads to Van der Waals links , but a region's molecule cannot become all lined in the same directions .
http://www.youtube.com/watch?v=4VmMr9TWzY4
http://media-2.web.britannica.com/eb-media/65/265-004-9B256ADC.gif
Pretty simple , as a matter of fact .
What pulls the South Pole of a magnetic compass?
The south pole of a magnetic compass is pulled towards the Earth's north magnetic pole, and away from Earth's south magnetic pole. Or towards and away the corresponding poles of any other magnet. Note that Earth's NORTH magnetic pole is close to the SOUTH pole.
Does the moon have magnetic poles?
The Moon has a solid core, and therefore has no magnetic field or poles.
What feature of earth makes a compass needle point north?
What features of the earth makes a compass needle point north
What is the property of floating when two poles are placed one on top of the other?
Magnetic levitation.
Is it true or false magnet usually attract the metal iron tin cobalt?
True. Magnets typically attract materials that are magnetic, such as iron, tin, and cobalt.
What 3 metals can be made into magnets?
Cobalt, iron, and nickel exhibit ferromagnetism at reasonable temperatures. Check the Wikipedia article on "ferromagnetism", for additional materials that exhibit ferromagnetism - some of them are compounds, and some only exhibit ferromagnetism at temperatures that are too low for many practical uses (for example, Dysprosium requires a temperature below 88 kelvin).
How do magnets attract and repel each other?
Not only magnets, but metal repel. There are two kinds of charges that metal contain, positive and negative. If you push a positively-charged magnet towards another positively-charged magnet, they'll repel, maybe because one type of charge needs the other to attract. If this one type of charge comes close to another charge of the same kind, it won't receive what it needs, and feel "resent" to the other charge, then repel. If you push a negatively-charged magnet towards another negatively-charged magnet, they will also repel.
How do you know that the compass point at north always?
The Earth's magnetic field causes a compass needle to align with the magnetic North Pole, which is located near the geographic North Pole. This makes the compass point to the north direction consistently.
Will a magnet attract metal screw?
Take any fastener and rap it on a magnet several times and you'll magnetize it to a degree. Or wrap a coil of wire around it, power it up with a DC source, and then smack the fastener (screw) a bunch of good licks while it's under the influence of the electromagnetic field. The screw will become pretty well magnetized, at least enough to hold it onto a driver bit.
Comment
A compass points to Magnetic North, not to the north magnetic pole. They are two different things -the first is location, the second is magnetic polarity.
What will happen if a North Pole of bar magnet near the North Pole of suspended magnet?
In magnetism, two like poles will repel each other. Remember that opposites attract.
Led can absorb it for it will terminate what it needs.
Is alpin a magnetic substance?
Alpin is not a naturally magnetic substance. It is a mineral that belongs to the garnet group and does not possess magnetic properties on its own.
Is a magnet considered a substances of chemacals?
No, a magnet is not considered a substance of chemicals. It is a material that generates a magnetic field due to the alignment of its atoms. Chemical substances are composed of specific elements in defined ratios.
