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Matter that does not give off electromagnetic radiation is known as dark matter. Dark matter does not emit, absorb, or reflect light, making it invisible and detectable only through its gravitational effects on visible matter in the universe. Its exact nature and composition remain unknown to scientists.
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Why do electro-magnets stop working when you flip the switch?
When you flip the switch to turn off the electromagnet, the flow of electric current stops, which in turn stops the magnetic field from being produced by the coil. The magnetic field is generated by the flow of electric current through the coil, so cutting off the current stops the magnetic field, causing the electromagnet to stop working.
Why is an electro magnet a temporary magnet?
An electromagnet is a temporary magnet because it only produces a magnetic field when an electric current is running through it. When the current is turned off, the magnetic field collapses, and the electromagnet loses its magnetic properties.
How can you control the magnetic field of a magnet to turn it on and off?
To control the magnetic field of a magnet and turn it on and off, you can use an electromagnet. By passing an electric current through a coil of wire wrapped around a magnetic material, such as iron, you can create a magnetic field. When the current is turned off, the magnetic field disappears, effectively turning the magnet off.
What two forms of energy that resistors can give off?
Heat energy as radiant heat Light energy if the resistor gets hot enough it will glow Sound energy, some resistors will hum at certain voltages Magnetic, electricity travelling through a wire will induce a magnetic field.
What are the benefits of using an electromagnet rather than a bar manet?
An electro-magnet can be switched on & off - a bar magnet is 'permanent' Think of a scrap-yard. If the magnet they use to pick up huge quantities of metal were permanent, they'd have to manually remove every piece. With an electro-magnet, they simply turn the power on to pick up a load, and off when they want to release it. You can make your own electro-magnet with a battery, some wire and a large nail.
What type of energy does a black light give off?
Optical energy electro-magnetic energy in the UV-section of the spectrum radiated energy
Do sunspots give off magnetic rays?
Sunspots do give off magnetic rays.
Why do stars give off electromagnet radiation?
they are magnetic
What kind of force does a magnent give off?
Magnet* does*, and i gives off magnetic energy.
How are the energy and wavelength of electro magnetic radiation related?
The Relationship is the 'Flux' of the magnetic field.Changing the amount of energy will not effect the wavelength (except to choke off the field when it becomes too dense)and increasing the wavelength will increase the energy density (flux)
Why do electro-magnets stop working when you flip the switch?
When you flip the switch to turn off the electromagnet, the flow of electric current stops, which in turn stops the magnetic field from being produced by the coil. The magnetic field is generated by the flow of electric current through the coil, so cutting off the current stops the magnetic field, causing the electromagnet to stop working.
What magnet can be switched on and off?
An electro-magnet can be turned on and off.
What is relay driver?
A relay is an electro-magnetic switch which is useful if you want to use a low voltage circuit to switch on and off a light bulb (or anything else) connected to the 220v mains supply.
How are electro magnets different from other magnets?
Electromagnets use electricity to create a magnetic field, which can be turned on and off. They are typically stronger than permanent magnets. In contrast, permanent magnets, like those made of iron or nickel, are always magnetic without the need for an external power source.
Why are hard magnetic materials used to make electromagnets?
Hard in this sense means materials that are themselves not easily magnetised. In fact, the part that you are referring to isn't really the magnet - it is the core, the magnetic field is produced by the coil, the core just concentrates the field. In an electro-magnet, the core must retain little or no field when the coils are not excited/energised. This means that items picked-up/attracted by the electro-magnet are no longer attracted when the coil is denergised - you can unload/drop the load from your crane or hoist by switching off the electro-magnet.
What type of energy does a portable CD player give off?
kinetic. Possibly minute magnetic.
What gives off electromagnetic radiation?
Many things give off electromagnetic radiation. Cell phones, the body, x-rays, and supposedly ghosts and spirits. EMF detectors (or electro-magnetic-field detector) are also supposed to pick up electromagnetic radiation given off by anything it's pointed at.
