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The most efficient method of demagnetizing a magnet is to use an alternating current?
Wiki User
∙ 11y ago
dc with reversing and step-down control
Wiki User
∙ 11y ago
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Moving a magnet in and out of a coil of wire produces?
That will induce a voltage across the wire.
Does a vacuum cleaner need a magnet to work?
Some kind of magnet or magnetic field is necessary for a motor to operate. Alternating current vacuum cleaners (that plug into the wall) have motors with electromagnets. Direct current vacuum cleaners (that plug into the car's cigarette lighter socket) have motors with permanent magnets.
How does a magnet work in a refrigerator?
A magnet is a substance that is made of iron. The molecules in it are arranged in a way different than most magnets which is why the magnet has a tendency to attract materials more. Instead of the fridge magnet having a distinct north or south pole attraction, the fridge magnet has both alternating. This actually gives a stronger force of attraction. When the magnet is brought in contact or brought close to the fridge, the force between the north and south poles of the body of the fridge and the magnet attract each other, and the alternating poles on the magnet attract as well, giving that extra attraction.
What magnet is created by an electric current?
Current flow
A magnet inside a wire loop can produce a current?
Only while the magnet is entering or leaving the loop. If you hold it still, no current is generated. The same goes for a longer magnet where the loop is being moved, but the magnet always remains inside the loop; no current.
What is alternating current normally produced by?
Alternating current is normally produced by rotating the magnet in the coil of an induced alternating voltage. When connected to a circuit, an alternating current will flow.
What must a magnet do to generate an alternating current?
To generate an alternating current, a magnet must use kinetic energy. This means that the magnet must move at a certain speed and velocity in order to create a strong enough energy charge.
How is magnetizing an object the opposite of demagnetizing a magnet?
Demagnetizing. Place the magnet at the opposite end of the metal from where you magnetized it. Again, the magnet must make as much contact with the metal as possible. Rub the metal with the magnet in the opposite direction that you used to magnetize it.
Moving a magnet in and out of a coil of wire produces?
That will induce a voltage across the wire.
What would be produced if you moved a bar magnet in and out of the wire coil?
An alternating current.
What causes an alternating current in a generator?
The spinning magnet in generators.
How can you demagnetizing a magnet?
To demagetize a magnet you could smash one if the ends with a hammer. this will cause the order of atoms to rearange so that it's not magnetic.
How can the magnetism of a permanent magnet be weakened or removed?
Put it in a coil which has an alternating current in it. The AC current produces a magnetic field in the coil which alternates with the changing voltage. This changes the magnetism of the permanent magnet. Gradually reduce the current in the coil and the permanent magnet will end up unmagnetised.
Will magnets lose it's power by rubbing?
You can destroy the magnetism of a magnet by hammering ,heating or using a alternating current method.
What is generated when a permanent magnet is moved in front of a coiled wire and the magnet's magnetic field pushes and pulls electrons in the coiled wire?
an AC, or alternating current
How does a electromagnet differ from permament magnet?
an electromagnet performs its magnetic property only when it is conducted with currents(either direct current or alternating current) while the permament magnet is the kind of material which show its magnetic property in the common situation.
How does a resonant frequency with which wire vibrates induces the alternating current in the coil magnet?
frequency does not make wires vibrate at resonance the impedance is at its highest point
