What is magnetism?

What is magnetism?
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1 Answer

Answer :

Magnetism is a force which appears between magnets and magnetic materials like steel and iron. For example, a magnet will attract steel pins and iron nails brought near it.
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Related questions

How Magnetism Works

Description : How Magnetism Works

Last Answer : How Magnetism Works Magnetism is a physical force. It causes certain objects to attract or repel another object. This mainly occurs in objects of metallic composition. Magnetism is caused by the motion and ... a south pole. A magnet would always have two poles even if it breaks into several pieces.

Explain the concept of anti-Ferro magnetism and state its significance.

Description : Explain the concept of anti-Ferro magnetism and state its significance.

Last Answer : When the neighboring magnetic moments are aligned anti-parallel. This phenomenon is called anti ferromagnetism. This phenomenon occurs below a certain temperature known as Neel temp (TN) Eg.: Cobalt oxide, Nickel oxide, Chromium.

The process of removing the unwanted magnetism is called ______

Description : The process of removing the unwanted magnetism is called ______ A) Unmagnetization B) Degaussing C) Diamagnetization D) Depoling

Last Answer : The process of removing the unwanted magnetism is called Degaussing

If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be?

Description : If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be?

Last Answer : If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be zero.

In D.C. machines the residual magnetism is of the order of?

Last Answer : In D.C. machines the residual magnetism is of the order of 2 to 3 percent.

What is a switch? How does it work?

Description : What is a switch? How does it work?

Last Answer : Switch is a bridge in which electric current flow along the wire. An electric current can be turned on and off by a switch. When you turn the switch on, a small metal piece inside the switch ... turn the switch off, the metal piece moves away from the wire, and the electric current stops flowing.

What is a magnetic field?

Description : What is a magnetic field?

Last Answer : The area around a magnet in which its magnetic force acts is called a magnetic field.

What is the difference between a temporary and a permanent magnet?

Description : What is the difference between a temporary and a permanent magnet?

Last Answer : A piece of steel or iron which keeps magnetic properties is called a permanent magnet. When piece of iron becomes magnetized when it is touched by magnet, which means magnetism has been induced in it. ... away from the magnet, it loses its magnetism. This type of magnet is called a temporary magnet.

What are conductors?

Description : What are conductors? 

Last Answer : Materials that allow an electric charge to pass along them are called conductors. Metals are good conductors of electricity.

What is an electric circuit?

Description : What is an electric circuit?

Last Answer : The pathway along which charged particles move is called an electric circuit. 

What is lightning?

Description : What is lightning?

Last Answer : When positive and negative charges in the clouds jump towards each other through the air. The electric Current makes a spark which is seen as a flash of lightning.

How can a body be tested for the presence of a charge?

Description : How can a body be tested for the presence of a charge?

Last Answer : A body can be tested for a charge in the laboratory with the help of an instrument called a gold leaf Electroscope.

What is electrostatic induction?

Description : What is electrostatic induction?

Last Answer : The process in which positive charge object produce the negative charge when it’s brought close to a neutral object. This process is called electrostatic induction.

What are ions? How are ions formed?

Description : What are ions? How are ions formed?

Last Answer : Ions are the individual atom or group of atoms. Ions formed when individual atom, or group of atoms having a net electric charge (either positive or negative) due to loss or gain of one or more electrons.

What is an atom made up of?

Description : What is an atom made up of? 

Last Answer : Atoms are made up of protons, neutrons and electrons. 

Why don't magnets lose their magnetism?

Description : Why don't magnets lose their magnetism?

Last Answer : They can if you strike them. Unless it is a permanent magnet.

I just held a lighter to a magnet and it lost its magnetism. Why?

Description : I just held a lighter to a magnet and it lost its magnetism. Why?

Last Answer : This is too science-y for me but there’s a well-documented experiment here concluding the fact that heat reduces magnetic fields (or force, or whatever).

Where was the first magnetism discovered ?

Description : Where was the first magnetism discovered ?

Last Answer : Magnetism was first discovered in China.

When a piece of iron is rubbed with a magnet it acquires magnetism ' What kind of change is this and why ?

Description : When a piece of iron is rubbed with a magnet it acquires magnetism ' What kind of change is this and why ?

Last Answer : When a piece of iron is rubbed by a magnet, it acquires magnetism ' is a physical or positional change. This is because when rubbed by a magnet, no other substance is formed from iron. Again , when a piece of magnetized iron is heated, it loses its magnetism and is converted into ordinary iron.

What is magnetism ?

Description : What is magnetism ?

Last Answer : The attractive and directional religion of a magnet is called its magnetism. In other words, the force of a magnet is called magnetism. Without magnetism, matter cannot be considered as magnet.

What is magnetism ?

Description : What is magnetism ?

Last Answer : : In physics, magnetism refers to the phenomenon of attraction or repulsion of one substance by another. In general, the religion of magnetism is called magnetism. Note that magnetism is the physical property of a magnet , not a chemical property.

What are the main religions of magnetism ?

Description : What are the main religions of magnetism ?

Last Answer : There are four main religions of magnetism.

What is the magnetism of a magnet ?

Last Answer : Magnetism of a magnet A: Physical properties.

How much magnetism does a salt have?

Description : How much magnetism does a salt have?

Last Answer : Need answer

What is a magnet that does not keep its magnetism very long?

Description : What is a magnet that does not keep its magnetism very long?

Last Answer : This would be a temporary magnet.

What has a form of energy that can produce heat light magnetism and electrical charges?

Description : What has a form of energy that can produce heat light magnetism and electrical charges?

Last Answer : if you mean to have commas between heat, light, magnetism, andelectrical charges then there is none. if heat light magnetism isall one thing then you're on your own.

What is a magnet that retains its magnetism?

Description : What is a magnet that retains its magnetism?

Last Answer : We generally refer to this as a permanent magnet.

How is the orientation of earths magnetism recorded in rocks of the ocean floor?

Description : How is the orientation of earths magnetism recorded in rocks of the ocean floor?

Last Answer : Earths magnetic orientation is locked into the rock when therock cools

Can you use magnetism to test a mineral?

Description : Can you use magnetism to test a mineral?

Last Answer : As magma rises as lava and cools to form rocks, any magneticminerals in the rock (eg magnetite and haematite) align themselveswith the earth's magnetic field. When the rock is solidified thismagnetism is ... north was. The position of magneticnorth is plotted on a map to show apparent polar wander.

How are magnetism and electricity the same?

Description : How are magnetism and electricity the same?

Last Answer : electromagnetic force

What is keeper and its use in magnetism?

Description : What is keeper and its use in magnetism?

Last Answer : A keeper is a iron or a steel bar that is used to retain thestrength of magnet.

Magnetism at the centre of a bar magnet is

Description : Magnetism at the centre of a bar magnet is

Last Answer : around- zero

Voltage build up in an isolated induction generator depends on A. Capacitor bank value B. Residual magnetism of the rotor iron C. Residual magnetism of the stator iron a) A, B b) A, B, C c) B d) A, C

Description : Voltage build up in an isolated induction generator depends on A. Capacitor bank value B. Residual magnetism of the rotor iron C. Residual magnetism of the stator iron a) A, B b) A, B, C c) B d) A, C

Last Answer : Ans: A

Magnetism at the centre of a bar magnet is - (1) minimum (2) maximum (3) zero (4) minimum or maximum

Description : Magnetism at the centre of a bar magnet is - (1) minimum (2) maximum (3) zero (4) minimum or maximum

Last Answer : (3) zero Explanation: The field at the center is not zero, but weak. At the exact center of a magnet the field lines are parallel (straight lines if we draw it). Anywhere else they are slightly divergent.

Photon is the fundamental unit/ quantum of – (1) gravitation (2) electricity (3) magnetism (4) light

Description : Photon is the fundamental unit/ quantum of – (1) gravitation (2) electricity (3) magnetism (4) light

Last Answer : (4) light Explanation: A photon is an elementary particle, the quantum of light and all other forms of electromagnetic radiation. The modern photon concept was developed gradually by Albert Einstein.

Magnetism in materials is due to - (1) electrons at rest (2) circular motion of electrons (3) protons at rest (4) all neutrons at rest

Description : Magnetism in materials is due to - (1) electrons at rest (2) circular motion of electrons (3) protons at rest (4) all neutrons at rest

Last Answer : (2) circular motion of electrons Explanation: Myopia is commonly known shortsighted. It is a condition of the eye where the light that comes in does not directly focus on the retina but in ... most commonly correct myopia through the use of corrective lenses, such as glasses or contact lenses.

If overloading a DC machine becomes necessary in an emergency, you should ____________. A. cool the machine with portable blowers and fans B. hold thermal overload relays open with blocks of wood C. inject small amounts of CO2 into the windings for cooling D. increase the residual magnetism value of windings to reduce eddy currents

Description : If overloading a DC machine becomes necessary in an emergency, you should ____________. A. cool the machine with portable blowers and fans B. hold thermal overload relays open with blocks of ... the windings for cooling D. increase the residual magnetism value of windings to reduce eddy currents

Last Answer : Answer: A

The insulation of electric generators during short idle periods should be _____________. A. allowed to cool slowly to ambient temperatures B. flashed with direct current to remove any residual magnetism C. kept warm by using strip or space heaters D. relieved of all capacitive charge by grounding the conductors

Description : The insulation of electric generators during short idle periods should be _____________. A. allowed to cool slowly to ambient temperatures B. flashed with direct current to remove any residual ... using strip or space heaters D. relieved of all capacitive charge by grounding the conductors

Last Answer : Answer: C

Which of the methods listed is used to start a AC generator turning? A. Residual magnetism remaining in the field poles. B. Residual magnetism remaining in the field coils. C. Residual magnetism remaining in the armature. D. Rotation by a mechanical prime mover.

Description : Which of the methods listed is used to start a AC generator turning? A. Residual magnetism remaining in the field poles. B. Residual magnetism remaining in the field coils. C. Residual magnetism remaining in the armature. D. Rotation by a mechanical prime mover.

Last Answer : Answer: D

The twisting force developed by a motor and applied to a shaft is called _____________. A. magnetism B. electromotive force C. torque D. voltage

Description : The twisting force developed by a motor and applied to a shaft is called _____________. A. magnetism B. electromotive force C. torque D. voltage

Last Answer : Answer: C

In replacing a defective transformer with a new one, which of the following actions must be carried out to insure proper operation of the equipment it serves? A. The secondary leads must be grounded for 10 minutes to remove static charges. B. The transformer connections must be made as before with regard to the indicated polarity. C. The iron core of the transformer must be flashed to pre-magnetize it. D. The iron core must be grounded for 10 minutes to remove any residual magnetism.

Description : In replacing a defective transformer with a new one, which of the following actions must be carried out to insure proper operation of the equipment it serves? A. The secondary leads must be grounded ... magnetize it. D. The iron core must be grounded for 10 minutes to remove any residual magnetism.

Last Answer : Answer: B

One of the generator bearing shells is generally insulated from the end housing in order to prevent _____________. A. rapid brush wear B. residual magnetism leak off C. excessive field winding heat D. circulation of shaft currents

Description : One of the generator bearing shells is generally insulated from the end housing in order to prevent _____________. A. rapid brush wear B. residual magnetism leak off C. excessive field winding heat D. circulation of shaft currents

Last Answer : Answer: D

Loss of or weak residual magnetism in an alternator or generator can be corrected for by _________________. A. running the rotor in the opposite direction for 5 minutes B. allowing the generator to run at 10% of normal speed for 5 minutes C. running the generator at normal speed with the field rheostat fully counterclockwise D. using a storage battery or battery charger to 'flash' the field

Description : Loss of or weak residual magnetism in an alternator or generator can be corrected for by _________________. A. running the rotor in the opposite direction for 5 minutes B. allowing the generator ... rheostat fully counterclockwise D. using a storage battery or battery charger to 'flash' the field

Last Answer : Answer: D

If a magnetic controller contact fails to pick up when the operating coil is energized, one possible cause may be _______________. A. low spring pressure B. low voltage to the coil C. the residual magnetism of the contact faces D. dirty contact faces

Description : If a magnetic controller contact fails to pick up when the operating coil is energized, one possible cause may be _______________. A. low spring pressure B. low voltage to the coil C. the residual magnetism of the contact faces D. dirty contact faces

Last Answer : Answer: B

Insufficient brush pressure on a DC motor may cause _______. A. generator overload B. excess residual magnetism C. water vapor absorption D. sparking of the brushes

Description : Insufficient brush pressure on a DC motor may cause _______. A. generator overload B. excess residual magnetism C. water vapor absorption D. sparking of the brushes

Last Answer : Answer: D

The greatest detrimental effect on idle electrical equipment, such as cargo pump motors, is the _____________. A. loss of residual magnetism B. absorption of moisture in the insulation C. insulation varnish flaking D. dirt collecting on the windings

Description : The greatest detrimental effect on idle electrical equipment, such as cargo pump motors, is the _____________. A. loss of residual magnetism B. absorption of moisture in the insulation C. insulation varnish flaking D. dirt collecting on the windings

Last Answer : Answer: B

Who discovered the link between electricity and magnetism?

Description : Who discovered the link between electricity and magnetism?

Last Answer : Michel Faraday

Residual magnetism in steel for magnets is increased by the addition of (A) Nickel (B) Cobalt (C) Tungsten (D) Chromium

Description : Residual magnetism in steel for magnets is increased by the addition of (A) Nickel (B) Cobalt (C) Tungsten (D) Chromium

Last Answer : (B) Cobalt

Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets. (A) Chromium (B) Nickel (C) Tungsten (D) Cobalt

Description : Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets. (A) Chromium (B) Nickel (C) Tungsten (D) Cobalt

Last Answer : (D) Cobalt

Who discovered electro magnetism?

Description : Who discovered electro magnetism?

Last Answer : ‘Orsted’ a denish scientist discovered that whenever an electric current passes through a conductor, a magnetic field will be produced around that conductor in concentric circle. In addition to that heat will be produced in that conductor.