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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
When the suns magnetic poles switch positions?
When the sun's magnetic poles switch positions, it represents a natural process in the sun's magnetic field known as solar magnetic field reversal. This event occurs approximately every 11 years, marking the peak of the solar cycle. During this time, the magnetic field weakens, flips, and then strengthens again, impacting space weather and solar activity.
Why are the magnetic poles and the geographic poles of the earth not in the same place?
No, it can but it doesn't necessarily need a variable.
I have no idea what the previous answer means. The earth spins on its axis. The spin axis provide the geographic north and south poles.
On the other hand the earth's magnetism does not work like a bar magnet. Instead, the iron and cobalt core spins at a slightly faster rate than the rest of the earth. This sets up eddy electrical currents which creates magnetic fields. In the northern hemisphere, the magnetic fields join under Northern Canada.
Monarch butterflies use magnetic compasses
By S. MiliusMonarchs can check magnetic fields as a backup to their sun compass.
Built-in magnetic compasses may orient monarch butterflies during their mind-boggling, southwestern migration, according to new experiments in Kansas.
The butterflies flutter up to 2,500 miles in autumn from breeding grounds in the eastern United States and Canada to a winter haven in Mexico. These millions of migrants are going to a destination not one of them has ever seen.
The generation taking to the air in the fall represents the great-great grandchildren, or even more distant descendants, of the monarchs that left Mexico the previous spring. Yet the new generation returns to the same dozen or so roosting areas that their ancestors used.
Previous studies showed that monarchs can orient by the sun. The new work provides the first direct evidence that monarchs can also sense directions from the magnetic field, according to Orley R. Taylor of the University of Kansas in Lawrence. He, Jason A. Etheredge of Kansas, and their colleagues describe the results in the Nov. 23 Proceedings of the National Academy of Sciences.
"This is not the last word," Taylor says. "What the butterflies are doing is very complicated."
The researchers caught migrating monarchs in fall and released them into a tube, in which they crawled upward to a circular tabletop arena. In a room with no shielding from Earth's magnetic field, most of the butterflies took flight toward the southwest. In a shielded room, however, they flew in random directions.
Next, researchers created a magnetic field oriented in the opposite direction from Earth's. Butterflies then flew northeast, as if their compasses had reversed.
The team studied fall migrants because the same generation flying north in spring gets hard to handle, Taylor says. "They're completing a reproductive death run, like salmon," as he puts it. Females lay eggs daily even though their route covers 1,000 miles. By the end, "they have practically no wings left; they're crawling from plant to plant to lay eggs�it's awesome," Taylor says.
Charles Walcott of Cornell University calls the monarch paper "terrific" and notes that other researchers have been stumped by the challenge of devising a way to test butterflies for magnetic orientation.
For animal compasses, "we used to think there was a single secret," he says, sounding wistful. Studies now show that animals combine methods using "a Chinese-menu approach," Walcott explains. Night-migrating birds, for example, can orient by the sunset glow and star patterns as well as by the magnetic field.
Kenneth P. Able of the State University of New York at Albany says he suspects that magnetic orientation "is a very widespread ability." Honeybees, some wasps, some fish, sea turtles, and even a species of mole rat can take bearings magnetically. Also, "it looks like every migratory bird you test, if you do it right, has a magnetic compass," Able says. However, he points out, discovering a compass takes the scientists just a small step toward explaining how monarchs navigate.
"I'm not sure anybody is ever going to answer that," says Karen S. Oberhauser, who studies monarchs at the University of Minnesota. "Insects sense the world in very different ways from humans. They use things we can't perceive, maybe even things we can't conceive."
A compass would not work without a magnet. Inside the compass is a magnet which moves to line up with the Earth's natural magnetism. The north pole of the magnet is attracted to the south pole of the Earth. As such, the magnet moves to always be lining up in this way. When you use a magnet, you can see this in action as the needle moves around to always point northward and from knowing this, you can tell which way you are facing.
Read more: How_does_a_compass_use_magnetism
How will like poles of 2 magnets interact?
Like poles (e.g. North-North or South-South) of two magnets will repel each other. This is because they have similar magnetic fields that push against each other, causing them to move away from each other.
How are the earth and a bar magnet similar?
Both the Earth and a bar magnet have magnetic fields that extend outwards from their poles. They both have a north and south pole orientation, and like poles repel while opposite poles attract. Additionally, they both have the ability to interact with other magnetic materials in their vicinity.
What does field mean in physics?
In physics, a field is a physical quantity that exists at every point in space and time, with its value typically determined by its position. Fields can be gravitational, electromagnetic, or related to other forces, and they play a fundamental role in describing the interactions between particles and objects in the universe.
What materials can be magnetized and why?
Materials that can be magnetized are usually those that contain magnetic elements like iron, nickel, and cobalt. This is because the atoms in these materials have unpaired electrons that align in a consistent direction to create a magnetic field. Other materials, like steel and some alloys, can also be magnetized due to their composition and atomic structure.
Do circuits or electric currents have a magnetic field?
Yes, electric currents generate magnetic fields. This is described by Ampere's law in electromagnetism, stating that a current-carrying conductor produces a magnetic field around it. This relationship between electric currents and magnetic fields is fundamental to the operation of electromagnets and many electronic devices.
What are magnets most attached to?
Magnets are most attracted to ferromagnetic materials such as iron, nickel, and cobalt. These materials have unpaired electrons which allow them to be easily influenced by the magnetic field of a magnet.
Do magnets attract through leather?
Yes, magnets can attract through leather to a certain extent since leather is not a material that completely blocks magnetic force. However, the attraction may be weaker compared to attracting through materials like metal.
What kind of magnet can attract steel and iron due to electricity?
An electromagnet can attract steel and iron due to electricity. When an electric current flows through the coil of wire in an electromagnet, it creates a magnetic field that can attract ferromagnetic materials like steel and iron. The strength of the magnetic field can be controlled by adjusting the amount of electric current flowing through the electromagnet.
What is it called when two magnets stick to each other?
It is called Magnetism. You have probably learned about it in school
Which theory states every molecules of magnetic substance is a tiny magnet?
The theory that every molecule of a magnetic substance is a tiny magnet is known as the domain theory. In this theory, magnetic materials are made up of small regions called domains, where each domain consists of multiple atoms with their magnetic moments aligned in the same direction.
Why does a magnet pick up paperclips only when it gets close?
A magnet only picks up paperclips when it gets close because the magnetic field produced by the magnet is strongest near its surface. As the paperclip gets closer, it enters the magnet's strong magnetic field and is attracted to it.
What kind of magnets are in speakers?
There is usually a large circular magnet in speakers. When an electricial current is put through the speaker cone at a certain frequency it makes the magnetic fields around the magnet change. The cone is connected to the diaphragm of the speaker which vibrates, pushing the air, creating sound waves.
Do you expect paper clips to be attracted or not a attracted to a magnet?
Paper clips are typically made of steel, which is a ferromagnetic material. This means that paper clips are usually attracted to magnets due to the magnetic properties of the steel they are made from.
How can you see the invisible magnetic field?
You can see the invisible magnetic field by using iron filings. When sprinkled around a magnet, the iron filings align themselves to the magnetic field lines, making the lines visible. This technique helps visualize the magnetic field's direction and strength.
How are electro magnet like bar magnets?
Electromagnets and bar magnets both produce magnetic fields. They can attract or repel other magnetic materials, and the strength of their magnetic field depends on the strength of the current flowing through the electromagnet or the material of the bar magnet. Additionally, both electromagnets and bar magnets can be used in a wide range of applications, from speakers and motors to magnetic levitation systems.
What material must be found in an object in order for a magnet be attracted to it?
The object must contain ferromagnetic materials such as iron, nickel, or cobalt to be attracted to a magnet. These materials have unpaired electrons that align with the magnetic field, leading to attraction.
Can you recalibrate a magnetic rev counter?
No, magnetic rev counters are designed to measure engine speed using a magnetic pickup that generates electrical signals. Recalibration would likely involve adjusting the signal processing electronics rather than physical components. Contact the manufacturer or a qualified technician for assistance.
What role is played by molecular magnets to magnetize and demagnetize bodies?
The relative coercitivity of a material helps to magnetize and demagnetised a substance. If the coercitivity id low then the material can be easily demagnetized and vice versa. A substance can be magnetized by creating magnetic filed of opposite charges and demagnetized by creating same filed of charges.
Can magnets pull more than their own mass?
Of course., they can.. What matters is how much is magnetic power (being more specific, electrically magnetic flux.). The attraction between two magnets is tremendously high with higher flux density magnets. (if you are more interested to know about, can browse for neodymium magnets!).
How will calculate the power of magnet?
The electric power is measured the same as in any other electric circuit, in watts. You calculate this by multiplying the current (in amps) by the potential difference (in volts) across the circuit. So:
P = I V
If you meant how do we measure the strength of the magnetic field generated, there are two different vector fields that may be called "magnetic field". These are the H-field and the B-field.
The H-field may also be called the "magnetic field intensity", the "magnetic field strength", the "auxiliary magnetic field" or the "magnetising field". It is measured in amps per metre.
The B-field may also be called the "magnetic flux density", the "magnetic induction", or the "magnetic field". It is measured in teslas.
What does alignment have to do with magnet strenfth?
Alignment refers to the arrangement of magnetic domains within a material. When these domains are aligned in the same direction, the magnetic strength is increased because their magnetic fields reinforce each other. In contrast, if the domains are randomly oriented, the magnetic strength is weaker due to opposing magnetic fields canceling each other out.
