What type of magnets are produce by running electric current through a soft iron core?

1 Answer

Answer :

electromagnet

Related questions

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 : A direct current passing through a wire coiled around a soft iron core is the description of a simple ____________. A. magnetic shield B. electromagnet C. piezoelectric device D. electromagnetic domain

Last Answer : Answer: B

Description : In transformer, the core is made up of soft iron in order to pass the maximum A. flux B. current C. magnetic flux D. voltage

Last Answer : magnetic flux

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 : 1. Which alloy is used for making magnets for hearing aids? 2. Which year is celebrated as International Year of Biodiversity? 3. The United Nations declared 2011 as which International Year? ... Which is the largest island? 20. With which did the Civil Disobedience Movement in India commence?

Last Answer : Answer : 1. Alinco 2. 2010 3. Forest 4. Nickel and Iron5. Humayun 6. Nerves 7. The constitutionality of laws 8. Force and Pressure 9. Cirrus 10. Sasaram 11. Decreasing 12. North-East ... Lord Hardinge 16. National Development Council 17. Acetone 18. Suez Canal 19. Kalatdeitnunat 20. The Dandi March

Description : The best material for the core of a transformer is – (1) stainless steel (2) mild steel (3) hard steel (4) soft iron

Last Answer : (4) soft iron Explanation: Iron has a very large magnetic response: it greatly amplifies an applied magnetic field. The transformer's ability to transfer energy depends on the strength of the magnetic ... field is amplified. The input energy can then be lower while still having the same effect.

Description : The best material for the core of a transformer is (1) stainless steel (2) mild steel (3) hard steel (4) soft iron

Last Answer : soft iron

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 : What three elements besides iron make up the alloy alnico, used for making magnets? 

Last Answer : ANSWER: WLUMINUM, NICKEL, AND COBALT 

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 : Find the minimum number of cells required to produce an electric current of 1.5 A through a resistance of `30 Omega`. Given that the emf of each cell

Last Answer : Find the minimum number of cells required to produce an electric current of 1.5 A through a resistance ... .5 V and internal resistance `1.0 Omega`.

Description : Case hardening of a material is (A) Followed by tempering or carburising (B) Preceded by its tempering (C) Done to get a soft ductile interior with a very hard surface (D) Carried out to get extreme hardness in its core

Last Answer : (D) Carried out to get extreme hardness in its core

Description : Core of soft Computing is A. Fuzzy Computing, Neural Computing, Genetic Algorithms B. Fuzzy Networks and Artificial Intelligence C. Artificial Intelligence and Neural Science D. Neural Science and Genetic Science

Last Answer : D. Neural Science and Genetic Science

Description : are used for construction of core of electromagnets. (a) Soft magnetic materials (b) Hard magnetic materials (c) Either (a) or (b) (d) None of the above

Last Answer : (a) Soft magnetic materials

Description : Which of the following statements is true concerning all three-phase alternators? A. Each has three separate but identical armature windings acted on by one system of rotating magnets. B. Each has one ... The three phases always provide power to the load through three sets of slip rings and brushes.

Last Answer : Answer: A

Description : Ratio of voltages is inverse ratio of the A. transformer B. resistor C. iron core D. current

Last Answer : current

Description : If two coils are wound on a single iron core, what will a change in current in one coil cause in the other coil?

Last Answer : A change in inductance.

Description : What happens to the permeability of an iron core as the current increases from the operating point to a large value?

Last Answer : Permeability decreases

Description : 43 The purpose of providing an iron core in a transformer is to A.Provide support to windings B. Reduce hysteresis loss C. decrease the reluctance of the magnetic path D. reduce eddy current losses

Last Answer : C. Decrease the reluctance of the magnetic path

Description : A ferrite core has less eddy current loss than an iron core because ferrites have (A) High resistance. (B) Low resistance. (C) Low permeability. (D) High hysteresis.

Last Answer : (A) High resistance.

Description : Which of the following iron core electromagnets creates the greatest amount of magnetic flux: w) 1,000 coils, 2 amps of current x) 250 coils, 7 amps of current y) 700 coils, 3 amps of current 

Last Answer : ANSWER: Y -- 700 COILS, 3 AMPS OF CURRENT

Description : A ferrite core has less eddy current loss than an iron core because?

Last Answer : A ferrite core has less eddy current loss than an iron core because ferrites have high hysteresis.

Description : When secondary of a current transformer is open-circuited its iron core will be?

Last Answer : When secondary of a current transformer is open-circuited its iron core will be hot because of heavy iron losses taking place in it due to high flux density.

Description : Electric ovens using heating elements of _______________ can produce temperature upto 3000°C. (A) Nickel (B) Graphite (C) Chromium (D) Iron

Last Answer : Ans: C Chromium has high melting point.

Description : The filament of an electric lamp becomes white hot but the lead-in wires holding the filament are only slightly heated because they (a) have smaller current passing through them (b) have very low resistance (c) have higher melting point (d) are made of black iron

Last Answer : Ans:(b)

Description : Do the doors fix in place with magnets or do they use some type of latch or indention to hold the doors shut?

Last Answer : The doors use magnets to hold them shut. The doors have knobs for opening.

Description : High ash coals (A) Are soft & friable (poor strength and size stability) (B) Require longer time of carbonisation as ash offers resistance to heat transfer (C) Produce larger quantity of coke oven gas (D) None of these

Last Answer : (A) Are soft & friable (poor strength and size stability)

Description : Choose the correct statement about topical NSAID preparations: A. They produce high drug levels in the blood by avoiding hepatic first pass metabolism B. They produce high drug levels in ... a strong placebo effect D. Interindividual variability in clinical response to these preparations is minimal

Last Answer : C. They elicit symptomatic relief in soft tissue rheumatism mainly by a strong placebo effect

Description : A color television set employs a 25,000 volt electron accelerator to produce the picture and potentially harmful radiation which must be shielded against. The main component of this radiation consists ... which penetrate the picture tube x) soft x-rays y) microwaves z) ultraviolet radiation 

Last Answer : ANSWER: X -- SOFT X-RAYS

Description : The starting current of an electric motor is ________ the current flowing after the motor reaches its normal running speed. (a) nearly equal to (b) exactly equal to (c) less than (d) much greater than

Last Answer : Ans:(d)

Description : Do the new MacBook Pro Core i7 overheat while running Windows?

Last Answer : I doubt bootcamp would properly utilize the gpu switching on the fly. The drivers for windows in bootcamp are pisspoor. Why not run a virtual machine? VirtualBox is free. I have VMWare Fusion which is great, but ... because it half-way converted my Fusion vm, so now it doesn't work in either : (

Description : A marine cartilaginous fish that can produce electric current is

Last Answer : A marine cartilaginous fish that can produce electric current is A. Pristis B. Torpedo C. Trygon D. Scoliodon

Description : Give reason: Stationary coil and stationary magnet cannot produce induced electric current.

Last Answer : An emf is induced in the coil only when there is relative motion between the coil and the magnet.

Description : A marine cartilaginous fish that can produce electric current is (a) Pristis (b) Torpedo (c) Trygon (d) Scoliodon.

Last Answer : b) Torpedo

Description : An electric current can produce a) heating effect c)chemical effect b) magnetic effect d)chemical, magnetic and heating effect

Last Answer : d)chemical, magnetic and heating effect

Description : What is true about viruses without exception? (1) They contain a core of RNA (2) They can infect bacteria (3) They cannot produce antibodies (4) They can multiply only in host cells

Last Answer : (4) They can multiply only in host cells Explanation: Viruses do not contain enzymes for energy production or protein synthesis. For a virus to multiply, it must invade a host cell and direct the host ... proteins, and copies of its nucleic acid, using the host cell's ATP to power the reactions.

Description : What is true about viruses without exception? (1) They contain a core of RNA (2) They can infect bacteria (3) They cannot produce antibodies (4) They can multiply only in host cells 

Last Answer : They can multiply only in host cells

Description : Please ripley me due to emergency

Last Answer : To calculate the flux density in the ring, you need to use the following formula: B = (μ * I * N) / (2 * π * r) where: B is the flux density in the ring (in teslas) μ is the relative permeability ... 2 * π * 0.127 m) = 0.53 T So the flux density in the ring would be approximately 0.53 teslas.

Description : Why don't magnets lose their magnetism?

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

Description : Are magnets involved in mail delivery?

Last Answer : Only when dealing with love letters & valentine cards, magnets/attraction.

Description : Where can I get really cool car magnets?

Last Answer : I have seen these hanging out of the trunk before.

Description : Aren't gravity and magnets related strongly to one another, and if yes, wouldn't that give us our TOE?

Last Answer : all I understand this is a naive argument, but it would be a pleasure knowing your take on it :)

Description : Do magnets rust or react with water in any other unpleasant way?

Last Answer : no, don’t think so.

Description : Does anyone know a good place to find refrigerator magnets?

Last Answer : I usually find them under the refrigerator.

Description : Where can I find STRONG magnets?

Last Answer : answer:I would Google "neodymium rare earth magnets" I have never bought them online so I can't provide a link (that I trust) to a specific place to buy them.

Description : Who shows how to make electricity from magnets ?

Last Answer : Faraday and Henry show this process.

Description : How many and what are the religions of magnets ?

Last Answer : There are two religions of magnetism, namely, north and south.

Description : What attracts magnets ?

Last Answer : Reverse national magnet attracts poles.

Description : How many types of artificial magnets ?

Last Answer : Artificial magnets are magnets that are made in the laboratory using different magnets that are suitable for human work. There are two types of artificial magnets. Namely- 1. Permanent magnet and II. Temporary magnet.