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Electromagnets are only magnetised while the electrical current is switched on.
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∙ 7y ago
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What are hard and soft magnetic materials?
Colour: black, opaque. Streak: black. Lustre: metallic or dull. Cleavage: none. Hardness: 5.5-6.5. Specific Gravity: 5.2. Its diagnostic feature is that it is highly magnetic.
How can you magnetise an iton needle permanently using a strong bar magnet?
You magnetize an iron needle permanently by stroking it with a strong bar magnet.
What vibrates in a loudspeaker?
Loud speaker usually has two electromagnets (or a permanent magnet and an electromagnet). When an audio signal in the form of an electric signal with desired frequency is applied to both electromagnets in opposite direction at same time so that they act as magnets with same polarities facing. This makes them repel with the given frequency, thus producing sound.
What is most likely to be attracted by a magnet?
Iron, nickel and some of their alloys are attracted to magnets (only some types of steel). Also, the oppositely charged poles of other magnets or electromagnets.
How do you make a magnet by stroking?
by stroking a magnet the right way you will make the magnet very happy, this will cause it to magnetise better, much like stroking a cat or dog. a happy magnet is a strong magnet
What kinds of materials make good semiconductors?
Copper is a very widely used semiconductor. Copper wire is used in electromagnets and electric motors. In electromagnets, it is wound around a metal core with electricity flowing through it to magnetise the metal core. And the same basic principle applies to small electric motors, only, they are encased in a magnet so the opposite sides cause force it into a centrifugal motion.
Permanent magnets and electromagnets both hold their magnetism for a long period?
the answer is false Permanent magnets will hold their magnetism for a long period of time. Electromagnets will only remain magnetic as long as current is flowing through them.
What appliances have electromagnets?
I can only think of these appliances that has electromagnets. Microwave, Oven Toaster, Refregirator, and Freezer.
What are hard and soft materials?
The magnetic materials which can magnetise and de-magnetise easily are called "soft magnetic materials" example:-ferrites,iron-cobalt alloy. The magnetic materials which cannot magnetise and de-magnetise easily are called "hard magnetic materials" example:-aluminium(al),nickel-cobalt alloy.
What is the verb form for magnet?
magnetise
How do you magnetise copper?
you really can't
How does refrigerator works in electromagnets?
There is no electromagnetism but it only has magnet at its door
Do electromagnets lose strength?
Only once the electricity is switched off.
Are electromagnets use in fridge?
NO,THEY ARE NOT......only uses a normal magnet at the door.
What is the flow of electromagnets called?
Electromagnets
What metal is easier to magnetise iron or steel?
Iron.
How can you magnetise stainless steel?
Heating should do it
