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What else can I help you with?
Is a bar magnet a permanent magnet?
A permanent magnet is a magnet which will keep its magnetism for a very long time and is difficult to change. No, As I think a permanent magnet means they have abilities to hold the magnetism when they are magnetized. Such as Alnico permanent magnets, but in fact, they can be demagnetized,such as high temperature, hit each other,pulse waves, out magnetic field influence...What's more, different permanent magnetic material, have different abilities on holding magnetism,they can be used in different environments. you can find some details from some manufacturers website, to learn some knowledges.
Why is iron a soft magnetic material?
Iron is a soft magnetic material due to its unique crystal structure that allows its magnetic domains to easily realign in response to an external magnetic field. This property results in a high magnetic permeability and low coercivity, making iron well suited for applications where magnetic fields need to be rapidly and easily induced or changed.
Why is the core of a moving coil galvanometer made of soft iron?
The term galvanometer is used to refer to a meter which can measure small currents, usually in the mA (10-3A) or mA (10-6A) range. When a soft iron core is used, the magnetic field lines tend to crowd through the core. It is because soft iron core is ferromagnetic in nature. As a result, the strength of the magnetic field due to the field magnet increases, which in turn increases the sensitivity of the galvanometer.
Why is soft iron used for the core of an electromagent?
The main advantage of an electromagnet is it can be turned on and off. Iron is a soft magnetic material an therefore looses its magnetism very quickly, if you use a metal like like steel it will not loose it magnetism very easily and even if you turn off the current it will remain a magnet.
What do scrap heap magnets repel?
The strength of any electromagnet changes when the current (amperes) or the number of 'turns' of wire in its wire coil changes. Increasing either of them makes the magnet stronger.
How can you convert a soft iron into a magnet?
You can convert a soft iron into a magnet by placing it within a magnetic field, such as that produced by a permanent magnet or an electromagnet. By aligning the magnetic domains in the soft iron to match the external magnetic field, the soft iron becomes magnetized.
What is a non permanent magnet?
An electromagnet (a coil around a soft iron core) will only be magnetic when current changes in the coil and so is not permanent.
What distinguishes a permanent magnet from a temporary magnet?
Permanent magnets do not lose their magnetic ability. Temporary magnets, however, gain magnetic properties when they are touched or moved by a permanent magnet. The properties of a temporary magnet dissipates over time after the permanent magnet is removed.
How would you distinguish between soft iron a piece of copper and a magnet?
Soft iron will not have any magnetic properties unless it is magnetized, while a piece of copper will not be attracted to a magnet at all. A magnet will attract both soft iron and copper, but the attraction will be stronger for the soft iron due to its ability to become magnetized.
Why can't you make soft iron in to permanent magnet?
Soft iron cannot be made into a permanent magnet because it does not have the ability to hold its magnetism once an external magnetic field is removed. Soft iron has a high magnetic permeability, allowing it to easily magnetize and demagnetize, which makes it useful in electromagnetic applications such as electromagnets. Permanent magnets, on the other hand, are typically made from materials with high coercivity, which enables them to retain their magnetism once magnetized.
Explain why a magnet can attract pins but not matches?
A magnet is made of 'Soft' Iron. A pin has steel (iron) in it. A match does NOT have iron in it.
Permanent and temporary magnets?
A temporary magnet is something that has been magnetized that won't stay a magnet for long, such as a paperclip that you have rubbed with a magnet. A Permanent magnet is usually a Lodestone that is found naturally or is manufactured by a company. Permanent magnets are always magnetic.
What is the definition of magnetic keepers?
A magnetic keeper is a strip of soft iron or steel which is placed across the poles of a permanent magnet to help preserve the magnetism.
What is soft and hard iron?
One can deform a bar of iron elastically i.e. after the forces on the bar are removed , the iron bar will move back into its original, non deformed shape. You can already guess that there is a limit to elastically loading such an iron bar. Too large a force will deform the bar plastically or, in simpler words, forever. Back to flexible. I understand your question is about elasticity and iron has it to a limit.
How do you make permanent magnets?
A permnent magnet generally made by soft iron. When we put a core of soft iron in a strong magnetic field, by induction it's made permanent magnet.just superheat a peice of iron and put it in a precence of a strong magnetic feild and let it cool slowly(be sure to heat it enough so it glows red hot)
What is the difference between soft and hard iron?
The essential difference between soft iron and hard iron is in the crystalline structure of the metals. This is sometimes due to the presence of impurities, but the over-riding effect is that of heat treatment. The basic techniques (for iron) are to get it white-hot, then cool it slowly; this produces soft iron. Alternatively, get it dull red, or bright red, or yellow, or white, then plunge it into cold liquid. This process, called quenching, hardens the iron. Picking the correct colour before quenching gives just the hardness needed.
What is the difference between a permanent and non permanent magnet?
Permanent magnets are bar magnets or horse shoe magnets which has magnetism at all times. But non permanent also known as temporary magnets are usually electromagnets which would have magnetism only when current flows through the coil that surrounds it.
