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    a bar magnet is a permanent magnet, while an electromagnet is a temporary magnet. why is an electromagnet temporary?

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    Why Is an Electromagnet a Temporary Magnet?

    An electromagnet is a manmade device that acts almost exactly like a natural magnet. It has north and south poles that attract and repel north and south poles on natural magnets. It can attract certain kinds of of metals to it. The primary differences between an electromagnet and a natural magnet are the materials ...

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    Why Is an Electromagnet a Temporary Magnet?

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    How Is an Electromagnet Different From a Regular Bar Magnet?

    Updated April 25, 2017

    By Jason Thompson

    An electromagnet is a manmade device that acts almost exactly like a natural magnet. It has north and south poles that attract and repel north and south poles on natural magnets. It can attract certain kinds of of metals to it. The primary differences between an electromagnet and a natural magnet are the materials each is made of and the fact that when an electromagnet's power is switched off it loses its magnetic abilities, according to the National High Magnetic Field Laboratory.

    The Electromagnetic Effect

    As the Danish physicist Hans Christian Oersted discovered in the early 19th century, magnetic fields are caused by electric currents. While working in his laboratory, he discovered that all wires with a current flowing through them were able to affect compass needles as if they were magnets. This was called the electromagnetic effect, states MAGCRAFT Rare Earth Magnets.

    The Source of Magnetic Fields in Nature

    The atoms that make up natural magnets (like all atoms) are made of tiny negative electric charges called electrons, surrounding tiny positive electric charges called protons. The electrons are spinning and moving around their atoms, and this makes them small currents. The electrons of all atoms therefore generate tiny magnetic fields.

    Permanent Magnets

    According to the National High Magnetic Field Laboratory, in most substances these magnetic fields are pointing in every direction, so that all of these tiny magnetic fields usually don't add up to anything, because they work against one another too much. In some materials the fields can line up and act with one another, which gives the object a powerful magnetic field. Such objects are called magnets. Permanent magnets are always made of substances like magnetite, iron, nickel, or neodymium.

    Parts of an Electromagnet

    A electromagnet is made up out of a coil of wire, a battery, and a chunk of iron. Copper, a nonmagnetic material, is wound around the iron, which is called the “core.” While iron can be made into a permanent magnet, the iron core of an electromagnet is not a magnet. All of the materials an electromagnet is made of are nonmagnetic.

    How Electromagnets Work

    When the battery is connected to the coil, current starts to flow through it. As Oersted discovered, this makes the wire that the coil is made of generate a magnetic field. Because the wire is coiled up tightly, these magnetic fields stack up. Because iron has a high magnetic permeability, it reinforces the field generated by the wire. However, as soon as the power from the battery stops, the current stops, and this means that the magnetic field vanishes. This is the reason that electromagnets are temporary magnets, explains the National High Magnetic Field Laboratory.

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    About the Author

    Jason Thompson has been self-employed as a freelance writer since 2007. He has written advertisements, book and video game reviews, technical articles and thesis papers. He started working with Mechanical Turk and then started contracting with individuals and companies directly via the Web.

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    Electromagnetism Assignment Flashcards

    Start studying Electromagnetism Assignment. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

    Electromagnetism Assignment

    5.0 73 Reviews

    Which electromagnet is the strongest?

    Click card to see definition 👆

    c) image

    Click again to see term 👆

    Fill in the word that completes the statement.

    The direction of the magnetic field produced by an electric current will change when the direction of the___changes.

    Click card to see definition 👆

    current

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    1/8 Created by dxddysam

    Terms in this set (8)

    Which electromagnet is the strongest?

    c) image

    Fill in the word that completes the statement.

    The direction of the magnetic field produced by an electric current will change when the direction of the___changes.

    current

    A bar magnet is a permanent magnet, while an electromagnet is a temporary magnet:

    Why is an electromagnet temporary?

    An electromagnet is caused by the flow of electric current. The electromagnet is only on while current is flowing. When the current is turned off, the electromagnet turns off.

    Which factors affect the strength of an electromagnet? Check all that apply.

    b) the amount of current flowing through the wire

    c) the number of coils in the wire

    e) the material of the core

    Use the drop-down menu to complete the statement.

    Increasing the amount of current that flows through a wire ____the strength of an electromagnet.

    increases

    Nineteenth-century English scientist Michael Faraday found that if he moved a magnet through a loop of wire, an electric current flowed in that wire:

    What process did Faraday discover?

    b) electromagnetic induction

    Suppose you take a short piece of wire that is not attached to anything and move it up and down in a magnetic field:

    Explain whether or not a current will be induced, and why.

    A current will not be induced because the wire is not part of a closed circuit. The electrons have no place to flow to.

    You are trying to induce a current and have put together the setup shown:

    What needs to be added in order for current to flow in the wire:

    a magnet

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    Can a heat engine be made to operate without creating any "thermal pollution," that is, without making its cold reservoir get warmer in the long run? The net work output must be greater than zero.

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    Agnes Pockels (1862-1935) was able to determine Avogadro's number using only a few household chemicals, in particular oleic acid, whose formula is

    \mathrm { C } _ { 18 } \mathrm { H } _ { 34 } \mathrm { O } _ { 2 }

    C 18 ​ H 34 ​ O 2 ​

    . (a) What is the molar mass of this acid? (b) The mass of one drop of oleic acid is

    2.3 \times 10 ^ { - 5 }

    2.3×10 −5 g and the volume is

    2.6 \times 10 ^ { - 5 } \mathrm { cm } ^ { 3 }

    2.6×10 −5 cm 3

    . How many moles of oleic acid are there in one drop? (c) Now all Pockels needed was to find the number of molecules of oleic acid. Luckily, when oleic acid is spread out on water, it lines up in a layer one molecule thick. If the base of the molecule of oleic acid is a square of sided, the height of the molecule is known to be 7d. Pockels spread out one drop of oleic acid on some water, and measured the area to be 70.0

    Source : quizlet.com

    Is an electromagnet a temporary or a permanent magnet?

    Is an electromagnet a temporary or a permanent magnet? Electromagnets: A permanent magnet is a magnet that retains its magnetion. A small permanent magnet can be used to hold notes onto the door of a refrigerator. Neodymium magnets are very powerful permenent magnets used in hard drives of computers. Sometimes we do not want a […]

    Is an electromagnet a temporary or a permanent magnet?

    November 28, 2020 by Veerendra

    Is an electromagnet a temporary or a permanent magnet?

    Electromagnets:

    A permanent magnet is a magnet that retains its magnetion. A small permanent magnet can be used to hold notes onto the door of a refrigerator. Neodymium magnets are very powerful permenent magnets used in hard drives of computers.

    Sometimes we do not want a magnet to stay magnetised all the time. We want it to lose its magnetism so that it can release the object attracted to it. Such magnets are called temporary magnets.

    An electromagnet is a temporary magnet. It is made by winding a coil of insulated wire round a soft iron core.

    When a current is passed through the coil, the magnetic field produced by the current magnetises the soft iron core. The soft iron core loses all the magnetism when the current is switched off.

    An electromagnet is a temporary magnet which magnetic field is produced by the flow of electric current in a coil wound round a soft iron core.

    The electromagnet uses the magnetic effect of an electric current. A wire carrying a current produces a magnetic field in the region around the wire.

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    What are some devices that use electromagnets?

    Applications of Electromagnets:Lifting Electromagnets

    heavy iron or steel objects such as scrap iron from place to place.

    The electromagnet is placed at the end of the cable at the arm of a crane.

    It consists of a circular soft iron core and windings made of insulated copper wire.

    There are opposite poles on the surface of the electromagnet as shown in Figure. This produces a stronger magnetic field to enable the electromagnet to lift heavier objects.

    When the power supply is switched on, the soft iron is magnetised to become a very powerful magnet.

    It lifts up iron and steel objects and separate them from non-magnetic objects.

    When the crane has moved to a new location, the power supply is switched off and the objects fall off.

    Electric Bell

    The electric bell is commonly used in schools as the fire alarm systems.

    The electric bell has a very simple but efficient design. There are very few moving parts. A well made electric bell can last for many years.

    Electromagnetic Relay

    An electromagnetic relay connects a primary circuit to a secondary circuit.

    A small current in the primary circuit will switch on a larger current in the secondary circuit.

    A relay is used in the starter system of a car. When the driver turns the key to start the engine, a small current is switched on in the primary circuit.

    Figure explains how the relay switches on a larger current in the secondary circuit to operate the starter motor of the car.

    Circuit Breaker

    A circuit breaker acts as an automatic switch that breaks open a circuit and switches off the current when the current becomes too large.

    In a household circuit, the current may become excessive when there is a short-circuit or an overload.

    When the current increases, the strength of the magnetic field of the electromagnet increases suddenly. The soft iron armature is pulled towards the electromagnet, as shown in Figure.

    This results in the spring pulling apart the contacts. The circuit is broken and the current flow stops immediately.

    After repairs have been made, the reset button is pushed to switch on the current again.

    Telephone Earpiece

    The permanent magnet attracts the magnetic alloy diaphragm with a constant force.

    Source : www.aplustopper.com

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