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.
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.
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.
An electromagnet can be turned on and off by controlling the electric current, giving it more versatility in applications. Additionally, the magnetic strength of an electromagnet can be easily adjusted by changing the amount of current flowing through it.
Magnetism is lost in an electromagnet when the electric current flowing through the coil is turned off or interrupted. This interrupts the magnetic field generated by the coil, causing it to demagnetize.
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.
The magnetic field strength of an electromagnet can be reduced by decreasing the current flowing through the coil, reducing the number of turns in the coil, using a material with lower magnetic permeability for the core, or increasing the distance between the magnet and the object it is attracting.
An electromagnet can be easily turned on and off by controlling the flow of electricity, while a natural magnet is always magnetic. In addition, the strength of an electromagnet can be adjusted by changing the amount of electric current, whereas the magnetic field of a natural magnet cannot be easily altered.
The switch in the electromagnet crane controls the flow of electric current to the electromagnet. It allows the operator to turn the magnet on and off, enabling them to pick up and release loads.
An electromagnet is switched on by passing an electric current through its coil, which generates a magnetic field. To switch it off, the current is simply disconnected, causing the magnetic field to collapse. This on/off switching allows for control of the magnetic force produced by the electromagnet.
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.
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.
A soft iron core can function as a switch in an electromagnet system by being magnetized when a current is applied, allowing the electrical circuit to be completed and turning on the switch. When the current is turned off, the soft iron core loses its magnetization, breaking the circuit and turning off the switch.
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.
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.
An electromagnet is a type of magnet that becomes magnetic when an electric current flows through it and loses its magnetism when the current is turned off.
Electric current.
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.
by decreasing its current,by decreasing turns of coil
Turning off the current in an industrial electromagnet will cause the magnetic field to weaken and eventually disappear. This is because the magnetic field is created by the flow of current through the coils of the electromagnet, so stopping the current flow stops the generation of the magnetic field.