Magnetism

A:

The electromagnetic spectrum gives the range of all the different kinds of electromagnetic radiation. Visible light is part of the electromagnetic spectrum, but it covers only a small portion of the spectrum.

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  • What is magnetic levitation?

    Q: What is magnetic levitation?

    A: Magnetic levitation is a method of supporting an object with the repulsive force of magnets and the stability of servomechanisms. The object is thus suspended in the air, counteracting the effects of gravity.
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  • How does magnetism affect everyday life?

    Q: How does magnetism affect everyday life?

    A: Science Clarified states that magnetism affects the daily lives of people in a number of ways, including contributing to advances in medicine and personal safety. Magnets are used in many electronic machines and devices.
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  • How do I describe how a compass needle aligns itself?

    Q: How do I describe how a compass needle aligns itself?

    A: A compass needle is made of magnetized material and points toward Earth's north magnetic pole no matter which direction the compass faces. Therefore, it is an excellent low-tech tool with which to find direction. Earth has a powerful magnetic field that emanates from the axis of rotation. Magnets are created from materials whose electrons all point the same direction and are attracted to an opposite charge.
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  • How do you make an electromagnet?

    Q: How do you make an electromagnet?

    A: An electromagnet can be constructed by wrapping an iron or steel bar with a current-carrying wire. When used as the core of an electromagnet, the ferromagnetic properties of iron or steel allow the magnetic domains to align. Wrapping a nail or other steel item with insulated wire, which is then hooked up to an electrical current, will magnetize the core. When powered, electromagnets function just like permanent magnets.
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  • Where does electromagnetic radiation come from?

    Q: Where does electromagnetic radiation come from?

    A: Electromagnetic radiation is energy that comes from a wide variety of sources. It comes in a broad spectrum of wavelengths, frequencies and energies. Scientists break the electromagnetic spectrum into several different categories, including electrical energy, radio waves, microwave energy, infrared light, the visible spectra, ultraviolet rays, X-rays and gamma radiation.
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  • How do you magnetize metal?

    Q: How do you magnetize metal?

    A: Metals and materials that contain metal can be magnetized either temporarily or permanently. Creating a temporarily magnetized metal can be achieved by bringing that metal in close contact with an already magnetized metal or by charging it with an electrical current. Permanent magnetization can occur by rubbing the metal with the poles of already magnetized materials or by hitting a metal while it is in a magnetic field.
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  • What can electromagnets be used for?

    Q: What can electromagnets be used for?

    A: Electromagnets are temporary magnets which have a magnetic field only when current passes through them. Some everyday applications of electromagnets include generators, motors, microphones, loudspeakers and cranes. Electromagnets are also used in scientific equipment such as particle accelerators, mass spectrometers and NMR (Nuclear Magnetic Resonance) spectrometers.
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  • What makes a magnet stronger?

    Q: What makes a magnet stronger?

    A: You can strengthen magnets by placing them in water, stacking them on top of each other or recharging them. The method of making a magnet stronger depends on the type of magnet you have, explains HowStuffWorks.
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  • Why do magnets attract metal?

    Q: Why do magnets attract metal?

    A: Magnets attract any metals that are made of iron or metals with iron in them. Magnets attract ferrous objects, such as iron, nickel, steel and cobalt.
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  • Why is the Earth like a magnet?

    Q: Why is the Earth like a magnet?

    A: Earth is like a giant magnet in several ways. Not only does it have a magnetic north and south pole that act similarly to the poles on bar magnets, but the planet is surrounded by a strong magnetic field, which is electrically charged and able to interact with magnetized matter.
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  • How are electromagnetic waves formed?

    Q: How are electromagnetic waves formed?

    A: Electromagnetic waves form from the vibrations of electric and magnetic fields. Unlike mechanical waves, electromagnetic waves do not need a medium to propagate, allowing them to travel through air, solids and even outer space.
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  • What are the pros and cons of Maglev technology?

    Q: What are the pros and cons of Maglev technology?

    A: In comparison with existing modes, Maglev technology is a better way of moving people and freight because it has a long service life and is faster, safer, cheaper and less congested. Maglev also saves energy because of its high efficiency and lack of pollution emission. However, Maglev guideways cost more than the conventional railway tracks. The lack of existing infrastructure is also a disadvantage.
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  • What is a U-shaped magnet?

    Q: What is a U-shaped magnet?

    A: A U-shaped magnet derives its name from its shape and has both a north and a south pole located in the same plane at the open end of the magnet. This type of magnet is also called a horseshoe magnet.
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  • What is magnetic energy?

    Q: What is magnetic energy?

    A: Magnetic energy is the energy within a magnetic field. This energy results in various metals either repelling or attracting each other.
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  • What causes attraction and repulsion in magnets?

    Q: What causes attraction and repulsion in magnets?

    A: The magnetic field lines of a magnet run from north to south, according to HowStuffWorks. The force leaves the north pole and enters the south pole of another magnet, which creates a closed loop. Magnets attract each other when their lines of force are running in the same direction, and they repel each other when their lines of force travel in opposite directions.
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  • What are different types of electromagnetic radiation?

    Q: What are different types of electromagnetic radiation?

    A: The spectrum of electromagnetic radiation is comprised of waves or particles that carry different amounts of energy. The visible spectrum is what humans and most animals see. The least energetic range of electromagnetic radiation is radio. Next is microwave radiation followed by infrared, visible, ultraviolet, x-ray and gamma-ray.
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  • How do magnets work?

    Q: How do magnets work?

    A: A magnet is an object or material that can produce a magnetic field of its own. That magnetic field is responsible for the property of magnets to attract or repel other magnets, and pull objects that are ferromagnetic, like iron. Electrons are the reason behind the production of magnetic fields and magnetism. In permanent magnets, spinning of electrons creates the magnetism.
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  • What are magnets made of?

    Q: What are magnets made of?

    A: Magnets are made of ferromagnetic materials that have been magnetized. Ferromagnetic materials include nickel, iron, rare earth elements and naturally occurring minerals such as lodestone.
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  • What are some examples of magnets?

    Q: What are some examples of magnets?

    A: One example of a magnet is a refrigerator magnet. These are also called permanent magnets because they always retain a certain degree of their magnetism. There some other general categories for magnets, such as temporary magnets and electromagnets.
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  • Why is iron magnetic and wood not?

    Q: Why is iron magnetic and wood not?

    A: Each atom of iron has an unpaired electron whose spin can be lined up to that of the unpaired electron from a neighboring iron atom. The spinning of the charged electron creates a magnetic moment, which in turn can align with an external magnet, thus making iron magnetic. Atoms of wood do not have unpaired electron spins that can line up with a magnet, and so it is non-magnetic.
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  • Where do you find magnets in a house?

    Q: Where do you find magnets in a house?

    A: In addition to the simple magnets on the refrigerator that hold up photos, coupons or shopping lists, magnets (often electromagnets) are also found in virtually any electric device or appliance with a motor, transformer, relay or solenoid.
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