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electromagnet
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∙ 14y ago
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What kind of magnet can vary its strength polarity?
an electromagnet
What kind of magnet can vary its strength and polarity?
Electromagnet
How can the strength of a scrap heap magnet vary?
The strength of a scrap heap magnet vary depending on the strength of the current or number of "turns" in its primary coil. Increasing either or both of these makes the magnet stronger.
How many iron nails can be lifted by the magnets?
That will vary inversely with the size/weight of the nails and directly with the strength of the magnet.
How do you calculate the magnetic dipole moment of a bar magnet?
The strength of a magnet can be determined by measuring its flux density (B) which is expressed in teslas. The flux density will vary according to where relative to the magnet it is being measured. The instrument for doing this is a flux-density meter (which was called a 'gaussmeter' - 'gauss' being an obsolete unit of measurement for flux density, from the cgsA metric system).
If you bring a bar magnet close to the first iron nail can the first iron nail attract and lift a second nail?
What happens if vary/change the distance between the magnet and the nail/s?
What happen if vary change the distance between the magnet and the nails?
the closer the magnet is to the nails the greater the magnetic force between the magnet and the nails
If you were to mechanically rotate the armature in an electric motor what would happen?
You said "armature" so it is a dc motor. Hence if the field is permanent magnet type then a voltage appears at the armature terminals nd its magnitude depends on the speed nd magnetic field strength. If it's field coils, then they must be seperately excited (if it don't possess residual). By changing the field strength you can vary the voltage produced at armature terminals.
How much weight can a 5 concrete slab hold?
The strength will vary depending on the type of concrete, the base, and the presence or absence of steel or fiberglass reinforcing.
What question do you have about portfolio assessment?
Questions that you may have about portfolio assessment can vary depending on the type of portfolio you have. You can ask questions on the quality, strength, criteria, and time frame.
How you do Speed control of permanent magnet synchronous motor?
To vary the speed of a permanent magnet synchronous motor, you need to vary the frequency of the AC power source. Of course, this also means you need to vary the voltage because the power factor is going to change, and you need to compensate for that or you might damage the motor.
How many paperclips can a bar magnet pick up?
Depending on how strong the magnet is the amount of paper clips it can pick up will vary. Why don't you test it for yourself?
