Magnetic keepers are used to protect magnets from : (1) Earth's magnetic field (2) effect of other magnets (3) self-demagnetization (4) demagnetization due to heating

1 Answer

Answer :

(3) self-demagnetization Explanation: Magnets have a tendency to lose their magnetism when their poles are left bare. This is called selfdemagnetization. Magnets are, therefore, protected by keeping them in magnetic keepers.

Related questions

Description : Magnetic keepers are used to protect magnets from : (1) Earth’s magnetic field (2) effect of other magnets (3) self-demagnetization (4) demagnetization due to heating 

Last Answer : self-demagnetization

Description : Which of the following principle is used to produce low-temperatures'? (1) Super conductivity (2) Joule-Kelvin effect (3) Thermo-electric effect (4) Adiabatic demagnetization

Last Answer : (4) Adiabatic demagnetization Explanation: Magnetic refrigeration is a cooling technology based on the magnetocaloiic effect. This technique can be used to attain extremely low temperatures, as well as the ... of a suitable material is caused by exposing the material to a changing magnetic field.

Description : Magnetic keepers are pieces of – (1) Nickel (2) Cobalt (3) Steel (4) Soft iron

Last Answer : (4) Soft iron Explanation: Magnetic keepers arc pieces of soft iron that are placed across the poles of a bar magnet or a horseshoe magnet. They help prevent the loss of magnetism.

Description : Magnetic keepers are pieces of (1) Nickel (2) Cobalt (3) Steel (4) Soft iron

Last Answer :  Soft iron

Description : Green house effect is the heating up of the Earth's atmosphere which is due to – (1) the ultraviolet rays (2) y-rays (3) the infra-red rays (4) X-rays

Last Answer : (3) the infra-red rays Explanation: The greenhouse effect refers to circumstances where the short wavelengths of visible light from the sun pass through a transparent medium and are absorbed, ... The trapping of the long wavelength radiation leads to more heating and a higher resultant temperature.

Description : Green house effect is the heating up of the Earth’s atmosphere which is due to (1) the ultraviolet rays (2) g-rays (3) the infra-red rays (4) X-rays

Last Answer : the infra-red rays

Description : How could you find out the shape of the magnetic field when two bar magnets are close to each other?

Last Answer : You can cover the magnets with paper and scatter iron filings onthe paper. Tap it gently and the filings should take up the patternof the magnetic field. Alternatively, a tiny compass called aplotting ... This ismore tedious but less messy, and can also show you the direction ofthe lines of force.

Description : How could you find out the shape of the magnetic field when two bar magnets are close to each other?

Last Answer : You can cover the magnets with paper and scatter iron filings onthe paper. Tap it gently and the filings should take up the patternof the magnetic field. Alternatively, a tiny compass called aplotting ... This ismore tedious but less messy, and can also show you the direction ofthe lines of force.

Description : What is one way to store a lot of potential energy in the magnetic field of the two interacting magnets?

Last Answer : You can store energy in a rubber band by stretching it, and this potential energy becomes kinetic energy when you let go

Description : If the Earth's magnetic field lines pass through the Hall probe in opposite direction, then the change in reading of voltmeter is A. thrice the Earth's magnetic flux density B. four times the Earth ... C. five times the Earth's magnetic flux density D. twice the Earth's magnetic flux density

Last Answer : twice the Earth's magnetic flux density

Description : The loss of energy over each A.C cycle magnetization and demagnetization of transformer, is called: a. Magnetization loss b. Hysteresis loss c. Demagnetization loss d. energy loss

Last Answer : c. Demagnetization loss

Description : A synchronous motor maintains synchronism with the rotating field because _____________. A. field strength varies directly with rotor slip B. DC current applied to the rotor coils causes the rotor ... the flux created by the excitation current D. the stator flux rotates in the opposite direction

Last Answer : Answer: B

Description : The effects due to electric current are: I. Magnetic effect II. Heating effect III. Luminous effect Application working on which effect can be used on AC as well as DC supply? a. I only b. II only c. II and III only d. I, II only

Last Answer : The effects due to electric current are: I. Magnetic effect II. Heating effect III. Luminous effect Application working on which effect can be used on AC as well as DC supply? a. I only b. II only c. II and III only d. I, II only

Description : What refers to the heating of the earth’s atmosphere not caused by direct sunlight but by infrared light radiated by the surface and absorbed mainly by atmospheric carbon dioxide?  A. Greenhouse effect  B. Global warming  C. Thermal rise effect  D. Ozone effect

Last Answer : Greenhouse effect

Description : Which of the following are pertinent to the realization of hydrological cycle? 1. Latitudinal difference in solar heating of the Earth's surface 2. Inclination of the Earth's axis 3. Uneven distribution of land and water 4. Coriolis effect (a) ... (b) 1, 2 & 4 only (c) 2, 3 & 4 only (d) 1, 2, 3 & 4

Last Answer : (b) 1, 2 & 4 only

Description : The Greenhouse Effect is caused primarily by which of the following processes? w) blocking incoming short wave solar energy x) absorbing incoming short wave solar energy y) heating of the Earth's stratosphere z) absorbing outgoing long wave radiation from the Earth

Last Answer : ANSWER: Z -- ABSORBING OUTGOING LONG WAVE RADIATION FROM THE EARTH 

Description : Are the magnetic lines force of a bar magnets strongest at the end of the magnet or in the middle?

Last Answer : Feel Free to Answer

Description : What is the relationship between the strength of magnetic fields and the distance between 2 magnets?

Last Answer : Need answer

Description : Magnets attract magnetic substances are iron, nickel, cobalt, etc. They can also repel - (1) paramagnetic substances (2) ferromagnetic substances (3) diamagnetic substances (4) non-magnetic substances

Last Answer : (3) diamagnetic substances Explanation: Those materials which when placed in a magnetic field become weakly magnetized in a direction opposite to that of the applied field, are called as diamagnetic materials ... : bismuth, antimony, copper, gold, quartz, mercury, water, alcohol, air, hydrogen etc.

Description : The frequency of an alternator at a given RPM is determined by the _____________. A. number of turns of wire in the armature coil B. number of magnetic poles C. strength of the magnets used D. output voltage

Last Answer : Answer: B

Description : One factor that determines the frequency of an alternator is the ____________. A. number of turns of wire in the armature coil B. number of magnetic poles C. strength of the magnets used D. output voltage

Last Answer : Answer: B

Description : Pick out the wrong statement. (A) A ferromagnetic material becomes paramagnetic above the 'Curie temperature' (B) Permanent magnets are made of hard materials, whereas electromagnets require soft ... hysterisis loss and coercive forces (D) Tungsten steel and alnico are not hard magnetic materials

Last Answer : Option D

Description : Hard magnetic materials are used for making (A) Permanent magnets. (B) Temporary magnets. (C) Conductors. (D) Insulator.

Last Answer : (A) Permanent magnets.

Description : Permanent magnets are made of (A) soft magnetic materials. (B) hard magnetic materials. (C) semi conductors. (D) super conductors.

Last Answer : (B) hard magnetic materials.

Description : Force due to magnetic field and velocity is A. at right angles to each other B. at acute angles with each other C. at obtuse angle with each other D. antiparallel to each othe

Last Answer : at right angles to each other

Description : Flemings "Left hand Rule" is associated with the effect of – (1) Electric field on current (2) Magnetic field on magnet (3) Electric field on magnet (4) Magnetic Field on current

Last Answer : (4) Magnetic Field on current Explanation: Whenever, a current carrying conductor comes under a magnetic field, there will be force acting on the conductor and on the other hand, if a conductor ... conductor. In both of the phenomenon, there is a relation between magnetic field, current and force.

Description : If materials become superconducting when cooled, any magnetic field will be expelled. This is called: w) diamagnetism x) repulsion y) the Landow Effect z) the Meissner effect

Last Answer : ANSWER: Z -- THE MEISSNER EFFECT

Description : Flemings “Left hand Rule” is associated with the effect of (1) Electric field on current (2) Magnetic field on magnet (3) Electric field on magnet (4) Magnetic Field on current

Last Answer : Magnetic Field on current

Description : Is it the customers or shop keeper's responsibility to check if a product is safe?

Last Answer : Both. The shopkeeper can get in trouble with the County food inspectors (in the US) for selling expired food (particularly perishables and dairy products, which spoil). But the consumer (your cousin) ... spoiled food. The downside, of course, is that your cousin will never be welcome there again.

Description : Who are the Oath Keepers, and what are they doing in Ferguson, MO?

Last Answer : answer:They claim to be an organisation of Patriots who refuse, and encourage others to refuse, unconstitutional orders . Of course, they did not exist during the time when Bush enacted the ... against their black co-citizens. They are a right wing, racist militia formed in opposition to Obama.

Description : Can you give your opinion as to whether "Finders Keepers" applies in this example of a lost wedding ring?

Last Answer : I think that “finders keepers” is a very crude ethical standard and that it would certainly behoove anyone who found an item that obviously belonged to someone else to make every effort to return it.

Description : Finders Keepers Law in NYS?

Last Answer : answer:I think the law is currently that you have to spend some time turning it in to find the owner, and if it is not claimed within a certain amount of time, then you can keep it. Did you find ... it. If there is nothing like that or no claims are made after a month, then I would just keep it.

Description : The most commenly maintained species of bee by bee keepers is

Last Answer : The most commenly maintained species of bee by bee keepers is A. Apis mellifera B. Apisdorsats C. Apis indica D. Apis florae

Description : Explain whether you support Mrs. Adis of saving a criminal from the keepers.

Last Answer : Explain whether you support Mrs. Adis of saving a criminal from the keepers.

Description : Mrs. Adis asks Peter Crouch whether he has had quarrel with the keepers. This shows that-

Last Answer : Mrs. Adis asks Peter Crouch whether he has had quarrel with the keepers. This shows that

Description : Mrs. Adis didn’t hand over Peter Crouch to the keepers because –

Last Answer : Mrs. Adis didn’t hand over Peter Crouch to the keepers because –

Description : How heat flow affects the Earth's magnetic field ?

Last Answer : Heat flow does not have a direct effect on the Earth's magnetic field, but it can affect the Earth's interior, which in turn can affect the magnetic field. The Earth's magnetic field is ... in order to better understand the dynamics of the Earth's interior and the behavior of its magnetic field.

Description : How does the Earth's magnetic field vary by altitude?

Last Answer : answer:That's a great question. While I don't have an answer for certain, I would guess that based on the shape of magnetic flux lines forming a sort of figure-eightish, elliptical pattern, that ... . Sorry to not have a real answer and just offer conjecture. I hope someone answers this accurately.

Description : What is the cause of reversals in Earth's magnetic field?

Last Answer : I have a geologist friend and his reply was Fuck knows . I don't have much of a chance of answering this myself. He states one theory, this is that the motion outer core shifts every Xnumber of years, this could ... we don't yet know. I'll tell him to find out for you. Life's work and all that.

Description : What is the vertical component of earth’s magnetic field? -Do You Know?

Last Answer : answer:

Description : How The solar wind can interact with Earths magnetic field to create powerful electrical currents that cause what near the poles?

Last Answer : Need answer

Description : What are Earth's magnetic field affects?

Last Answer : effects of earth's magnetic field:-The sun emits huge amount of solid charged particles every time(called solar wind). if these particles are allowed to enter our earth, then there would be no ... earth repels all these solid particles from the sun. by K. Sreramfrom India ,Tamil Nadu, Chennai

Description : What earths magnetic field affects?

Last Answer : effects of earth's magnetic field:-The sun emits huge amount of solid charged particles every time(called solar wind). if these particles are allowed to enter our earth, then there would be no ... earth repels all these solid particles from the sun. by K. Sreramfrom India ,Tamil Nadu, Chennai

Description : What earths magnetic field affects?

Last Answer : effects of earth's magnetic field:-The sun emits huge amount of solid charged particles every time(called solar wind). if these particles are allowed to enter our earth, then there would be no ... earth repels all these solid particles from the sun. by K. Sreramfrom India ,Tamil Nadu, Chennai

Description : Earth's magnetic field result from movement in the?

Last Answer : Scientists believe Earth's magnetic field results from movements of molten iron and nickel within its liquid outer core. These flows, which are caused by interactions between Earth's core and its mantle, are neither even, nor evenly distributed.

Description : What creates Earth's magnetic field?

Last Answer : Scientists think that the presence of the molten nickel iron layer of Earth's outer core and the spinning of the planet creates the magnetic field through the geodynamo mechanism.The geodynamo ... s magnetic field is generated by the electric currents in the conductive material of its core.

Description : What is the intensity of the magnetic field at the earth’s north pole? A. 32,000 nT B. 62,000 nT C. 32,000 µT D. 62,000 µT

Last Answer : B. 62,000 nT

Description : What is the approximate intensity of the magnetic field at the earth’s surface? A. 32,000 nT B. 62,000 nT C. 32,000 µT D. 62,000 µT

Last Answer : A. 32,000 nT

Description : What is the vertical component of earth’s magnetic field?

Last Answer :

Description : Pick up the correct statement from the following: (A) In the earth's magnetic field, a magnetic needle rests in magnetic meridian (B) The angle between the true meridian and the magnetic meridian is ... gravity tends to dip down towards the nearer magnetic pole of the earth (D) All the above

Last Answer : (D) All the above