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When we turn of the current in an electromagnet then electromagnet looses its magnetic property,provided the material used inside the current carrying solenoid is soft iron core. If, the material is steel then after the current is turned the magnetism propety still prevails and hence steel becomes a permanent magnet.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoA magnetic field is created when there is an electric charge which alters the region of the space. So yes, an electromagnet which uses electric current can "turn off" the magnetic field until it is induced by electric current.
Wiki User
∙ 11y agoThe magnetic field in an electromagnet is created in the core of that device by the movement of current through the coil of wire around the core. For the electromagnet to be effective, the current must be moving in one direction only. If the current is reversed rapidly back and forth (like if AC is applied), the electromagnet won't work. If the DC current simply undergoes a polarity change, the electromagnet will still work pretty much as well as it did, and that's that. Let's look just a bit further for the fun of it.
If we wrap a coil of wire about a ferromagnetic core and run DC through it, it will act as an electromagnet. If we shut the current off, the magnetic field about the coil disappears. The core will lose most of its magnetism, but a little will remain, and this is what we call residual magnetism. If we reverse the DC and turn the power back on, the electromagnet will again be operating, but with a tiny bit of loss due to the fact that a little bit of the core material was magnetically polarized in the opposite direction. It's not a big deal, but it might be helpful in the future. The residual magnetism left in the core by the original direction of the current flow will detract slightly from the new magnetic field set up when the polarity of the applied voltage is reversed.
The magnetic field in an electromagnet is created in the core of that device by the movement of current through the coil of wire around the core. For the electromagnet to be effective, the current must be moving in one direction only. If the current is reversed rapidly back and forth (like if AC is applied), the electromagnet won't work. If the DC current simply undergoes a polarity change, the electromagnet will still work pretty much as well as it did, and that's that. Let's look just a bit further for the fun of it.
If we wrap a coil of wire about a ferromagnetic core and run DC through it, it will act as an electromagnet. If we shut the current off, the magnetic field about the coil disappears. The core will lose most of its magnetism, but a little will remain, and this is what we call residual magnetism. If we reverse the DC and turn the power back on, the electromagnet will again be operating, but with a tiny bit of loss due to the fact that a little bit of the core material was magnetically polarized in the opposite direction. It's not a big deal, but it might be helpful in the future. The residual magnetism left in the core by the original direction of the current flow will detract slightly from the new magnetic field set up when the polarity of the applied voltage is reversed.
Wiki User
∙ 14y agoa magnetic field only persists when their is an electric current going through the electromagnet
Wiki User
∙ 11y agoThe field reverses to increase the current.
Wiki User
∙ 9y agoIt quits being a magnet, except for a small residual field retained by the core.
Wiki User
∙ 14y agoThe magnetic field collapses.
Wiki User
∙ 11y agohey
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When a switch in an electrical circuit is turned off what will happen?
Closing a switch in an electrical circuit will complete the circuit. The supply voltage will then be applied to that circuit, and current will flow through that circuit.
How can the magnetic field strength of an electromagnet be reduced?
Either increasing the size of the current (in amps) or the number of turns of wire wrapped around the core will make a stronger magnet. A larger current will make a stronger magnet (up until too much makes the wire melt!). Increasing the voltage forces more current through the electromagnet.
When is magnetism lost in an electromagnet?
Magnetism is lost in an electromagnet when the electricity is turned off.
What advantage does an electromagnet have against a bar magnet?
With an electromagnet, the magnetism can be turned on and off according to the whim or need of the operator.
What are two advantages of a electro magnet over natural magnet?
A permanent magnet is always on; there isn't any way to turn it off. An electromagnet can be controlled; you can turn it on or off, or change the amount of magnetism by varying the current passing through the coils.
What does the switch do to the electro magnet?
The switch is turned on to activate the electromagnet, and metal is attracted. Turning off the switch stops the electromagnet from working, and metal is no longer attracted.
How can you turn off an electromagnet?
An electromagnet requires electric power to be a magnet. You turn it off the same way you turn off a light, by turning the switch.
What can be done with an electromagnet that cannot be done with a regular permanent magnet?
Its strength can be easily manipulated (e.g. you can switch it off). Or the strength can be varied with the current. Electromagnets can reverse polarity (by reversing the current).
How does a car horn work?
FromWhile some modern car horns are actually specialized computer audio systems, the old-fashioned electromagnetic car horns are still common. An electromagnetic horn uses an electromagnet to attract a steel diaphragm and turns that electromagnet on and off rhythmically so that the diaphragm vibrates. In fact, it uses the diaphragm's position to control the power to the electromagnet. Whenever the diaphragm is in its resting position or even farther from the electromagnet, a switch closes to deliver electric current to the electromagnet. The electromagnet then attracts the diaphragm's center. But when the diaphragm moves closer to the electromagnet, as the result of this attraction, the switch opens and current stops flowing to the electromagnet. Because of this arrangement, the diaphragm moves in and out and turns the electromagnet off and on as it does. The diaphragm's tone is determined by the natural resonances of its surface.
When this is turned off the electromagnet is no longer magnetic?
Electric current.
How can you make a electromagnet lose its magnetism?
by decreasing its current,by decreasing turns of coil
How do you turn off an electromagnet?
This is what makes a magnet an electromagnet - the ability to turn it on and off... Anyway, electromagnets can be turned off with either the help of a switch, or just by disconnecting the power supply.
How does an electromagnet turn on and off?
They turn on and off by taking the battery out and putting it back in or if it has a switch then you could use that.
How do you deactivate an electromagnet?
Electromagnets are energized with an electric current. Turn the power off to stop the current will do the trick.
Electromagnet is a temporary magnet because you can?
turn it off by unplugging the current source.
Why electromagnet is different from a permanent magnet because an electromagnet what?
Mainly in that the electromagnet is NOT permanent. In other words, it can be switched on and off.Another relevant difference is that the electromagnet constantly requires power, at least while it is on.
Is a horseshoe electromagnet bar magnet or a magnet pole a example of a temporary magnet?
An electromagnet is temporary because the field disappears when the current is switched off.
