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Electromagnet is nothing but a coil wound with turns and whenever a current flows through it, according to Oertseds principle, a current carrying conductor produces magnetic field.

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Q: An electromagnet is a solenoid with a piece of ferromagnetic material within it?
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Coils of wire wrapped around a ferromagnetic core make up a motor's?

Coils of wire wrapped around a ferromagnetic core make up a motor's armature. It carries an electrical current and rotates within a magnetic field.


What is bloch wall energy?

180o domain wall between two domains is known as Bloch wall. The Bloch wall energy is competition between exchange energy and anisotropy energy within the interface of two domains. The exchange energy in a ferromagnetic material is a minimum only when adjacent spins are parallel. While anisotropy energy will be minimum when the spins remain parallel to the easy axis. Bloch wall energy will be minimum of exchange energy and anisotropy energy Mathematically, the Bloch wall energy for an uniaxial anisotropic material will be (sigma)exch+(sigma)anis=(JS2 pi2)/Na2+KuNa where J is exchange stiffness, N is number of atoms within the wall, a is distance between two adjacent atoms, Ku is the uniaxial anisotropy constant the minimum of this energy terms will be (sigma)dw~2pi(AKu)1/2 where A is the exchange stiffness constant. it is the energy of the Bloch wall in uniaxial ferromagnetic material. (read more in Cullity's Book)


What is the definition of nano ferrite composites?

Normally a composite material that includes nano scale ferritic compounds within the matrix material


What is the effect of variable area to the magnetic flux within the solenoid at constant number of windings and current?

area is equal to the magnetic flux, therefore it is equal.


How are most objects not magnetic?

Because of the lack of magnetic material within most objects.

Related questions

Is An electromagnet is a solenoid with a piece of ferromagnetic material within it?

True


What material is used in electro magnets?

The magnetic field in an electromagnet is actually produced by the coil of wires with a current running through it. However certain materials, termed 'ferromagnetic' materials concentrate the magnetic flux when a rod of the material is placed within the coil (termed the 'magnetic core'). The most common of materials used for this have been iron based.


Can you magnetize a bit of metal that is not a magnetic type of metal?

Generally, no you can't. A ferromagnetic material has what are called magnetic domains within it. These domains are effectively "tiny magnets" and are randomly arranged when they are in non-magnetized ferromagnetic metals. We can align them and make the material magnetic with the right equipment. A bit of metal that is not ferromagnetic has to domains to realign, so it can't be magnetized.


How do electromagnet work?

If a wire is wrapped around a ferromagnetic material (those which are attracted by a magnet) and a current is flown through the wire, the material behaves like a magnet. This phenomenon is known as electromagnetism. The electromagnet can attract other ferromagnetic material just like any magnet. Usually a soft iron-core is used for good results. By such a phenomenon you get a temporary magnet whose magnetic property can be switched on or of by a switch! You can try this at home by wrapping a wire around an iron-nail and using a battery for current.Hope this helps:)


What happens to the strength of an electromagnet and field when a stronger ferromagnetic material is used for the core?

The magnetic field would become a magnetizing field as far as the magnetic material is concerned. If the material is dia magnetic then the electrons magnetic moment would get aligned in such a way as the resultant magnetic field within the material becomes perpendicular to the magnetizing one. In case of para, resultant would become parallel to the external In case of ferro, domains get aligned and so intense magnetic induction results.


How is a electromagnet different then a permanent magnet?

I will attempt to answer this but my expertise on magnetics is low, so improvements are welcomed if necessary. The main difference is that an electromagnet requires a current to be magnetic, the potential difference means electrons flow to one end of the system (toward the anode) and so you polarise the material. Meaning one end is now positive, the other negative.At least, generally speaking.However if you took the current away, the material would reorder itself atom-wise and lose it's magnetic properties.A permanent magnet as we commonly know them exhibit ferromagnetic properties, meaning the atoms do not reorder so randomly in the absence of a current. They like being that way and so will stay that way permanently (within reason).Hence you can make some things magnetic by rubbing a magnet against then, reorganising their structure. If the material allows it to stay that way, you get a magnetic paperclip and so forth.


Coils of wire wrapped around a ferromagnetic core make up a motor's?

Coils of wire wrapped around a ferromagnetic core make up a motor's armature. It carries an electrical current and rotates within a magnetic field.


What is magnetic keeper?

A magnetic keeper, also known as a magnetic shunt or magnetic loop, is a piece of ferromagnetic material that is used to enhance and maintain the strength of a magnetic field. It is typically placed across the poles of a permanent magnet or an electromagnet to prevent the loss of magnetic strength when it is not in use or being used for a specific purpose. The magnetic keeper helps to redirect and concentrate the magnetic flux within the magnet, prolonging its effectiveness.


What material contained within the nucleus?

Chromatin material is contained within the nucleus.


What is the material within a cell like?

The material within a cell, known as cytoplasm, is gelatinous.


What are the small individual areas within a magnet called?

magnetic domains. itdescribes a region within a magnetic material which has uniform magnetization. This means that the individual magnetic moments of the atoms are aligned with one another and point in the same direction. Below a temperature called the Curie temperature, a piece of ferromagnetic material undergoes a phase transition and its magnetization spontaneously divides into many tiny magnetic domains, with their magnetic axes pointing in different directions. Magnetic domain structure is responsible for the magnetic behavior of ferromagnetic materials like iron. The regions separating magnetic domains are called domain walls where the magnetisation rotates coherently from the direction in one domain to that in the next domain.


What do you use electromagnets for?

Electromagnets are utilized in devices such as Electromagnetic Relays and Solenoids. They are also used at construction sites to sweep and pick up ferromagnetic materials such as scrap iron and steel. Other applications include levitating a vehicle over a steel track. The electromagnetic relay is commonly used to control switching of electrical power or signals within various electrical and electronics circuits. It operates using a mechanical apparatus that is attached to an electromagnet. When the electromagnet is switched ON (magnetized), the mechanical apparatus is attracted by the magnetism and made to operate a set of contact points, either to open or close the points. Solenoids are similar to electromagnetic relays in that they also utilize a mechanical apparatus and an electromagnet. However, when the electromagnet is switched ON, the resulting magnetism is much stronger and is typically made to operate a larger mechanism, such as the paddles in a pinball machine, or a water supply valve.