Recent questions tagged magnetic

asked Jan 6 by anonymous

Last answer: We have now looked at a number of ways in which matter can be grouped, such as into metals, semi-metals and non-metals; electrical conductors and insulators, and thermal conductors and insulators. ... information must be stored, in computers and TV's, as well as in generators and electric motors.

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asked May 27, 2020 by anonymous

Why does the magnetic field flow from north to south?

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asked May 7, 2020 by anonymous

State the material used for making (1) Magnetic Core (2) Fuse element

Last answer: The material used for making of: (1) Magnetic Core : Iron, cobalt, Nickel, CRGO, HRGO , silicon steel (2) Fuse Element: Tin- lead wire, Tinned copper wire

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asked May 5, 2020 by anonymous

Electro Magnetic Induction

Last answer: Electro Magnetic Induction

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asked May 5, 2020 by anonymous

Why does leakage occur in a magnetic circuit?

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asked May 5, 2020 by anonymous

Why is it necessary to keep air gaps in magnetic circuits as small as possible?

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asked Apr 27, 2020 by anonymous

Explain with neat diagram series and parallel magnetic circuits.

Last answer: Series magnetic circuit: When different magnetic materials having different lengths, cross sectional areas and permeability are connected one after another, in which same flux is established in different sections, then it is called series ... flux, Φ = Φ1 + Φ2 Path 1: BAFE Path 2: BACD

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asked Apr 26, 2020 by anonymous

Series Magnetic Circuits

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asked Apr 24, 2020 by anonymous

Important Terms in Magnetic Circuit

Last answer: .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

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asked Apr 24, 2020 by anonymous

Magnetic Circuit and its Analysis

Last answer: .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

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asked Mar 30, 2020 by anonymous

A magnetic circuit has effective iron length of 100 cm and it is wound with 800 turns of wire carries 1 A. Find the magnetic field strength.

Last answer: magnetic field strength

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asked Aug 5, 2019 by anonymous

Define magnetic permeability. State and explain the factors affecting permeability of magnetic materials

Last answer: Permeability : The capability of the magnetic material to conduct the magnetic flux is known as permeability. Permeability and hysteresis loss are inversely related to each other. Factors ... impurities affect the geometric pattern of the crystals and are harmful to the magnetic property.

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asked Sep 6, 2018 by anonymous

What arc the errors occurring in measuring devices due to stray magnetic field and temp '? Explain how to compensate them.

Last answer: 1. Error due to stray magnetic fields- Main magnetic field gets disturbed by external magnetic fields known as stray magnetic fields. 2. Compensation technique To avoid this error, ... resistance alloy having a negligible resistance temp coefficient in the ratio of 1:10 for pressure coil

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asked Sep 6, 2018 by anonymous

Explain magnetic effect employed in measuring instrument.

Last answer: Magnetic Effect: I) In PMMC meters: ➢ When a current is passed through a conductor, magnetic field is produced round the conductor. Due to this field when current ... field it experiences a mechanical force. Examples: Electrodynamometer type instruments, Induction type instrument.

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asked Sep 4, 2018 by anonymous

Define the following terms: i) Magnetic flux density, ii) Reluctance, iii) Magneto-motive force, iv) Permeance.

Last answer: (i) Magnetic flux density (B): It is the magnetic flux per unit area measured at right angles to the flux path. (Its unit is weber/m2 or tesla). (ii) Reluctance: It is the ... flux to set up through it and it is reciprocal of reluctance. Permeance = 1/ Reluctance. Unit: weber/ampere.

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asked Sep 4, 2018 by anonymous

Derive an expression for energy stored in a magnetic field .

Last answer: Expression for energy stored in a magnetic field: The energy is stored in magnetic field when current increases and return back when the current decreases. At instant t' seconds after closer of switch ... energy absorbed by the magnetic field when current increases from 0 to I amperes

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asked Sep 4, 2018 by anonymous

What is magnetic hysteresis? What is the cause of hysteresis?

Last answer: Magnetic hysteresis: When a magnetic material is subjected to cycle of magnetization, it is found that flux density (B) in the material lags behind applied magnetizing force (H). This ... the movement of orientation, due to which the flux density lags behind the magnetic field intensity.

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asked Sep 4, 2018 by anonymous

Define magnetic lines of force. Also draw and show magnetic lines of force of a bar type magnet.

Last answer: Magnetic Lines of force- These are the imaginary lines (having no physical existence) introduced by Faraday for the pictorial representation of the distribution of a magnetic field. OR A line of ... that the tangent at any point gives direction of the resultant force at that point.

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asked Sep 4, 2018 by anonymous

Classify magnetic materials and explain in brief.

Last answer: .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { ... the absence of external magnetic field. Following are the ferromagnetic materials: Iron, Cobalt, Nickel.

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asked Aug 10, 2018 by anonymous

State and explain Ohm's law for magnetic circuit.

Last answer: Ohm's law for electric circuit is V = I R where V is voltage, I is current, R is Resistance. Ohm's law for magnetic circuit is MMF = Φ X S where MMF is magnetomotive force (NI) ... . Resistance is the opposition to the flow of current while reluctance is the opposition to the flow of magnetic flux.

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asked Aug 8, 2018 by anonymous

Compare electric and magnetic circuit.

Last answer: .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

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asked Aug 8, 2018 by anonymous

Define magnetic circuit. Draw simple series magnetic circuit.

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asked Aug 8, 2018 by anonymous

Give the relation between magnetic field strength, magnetic flux density and permeability.

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asked Aug 8, 2018 by anonymous

Define magnetic flux density and state its formula.

Last answer: The magnetic flux per unit area is called as magnetic flux density. Magnetic flux density is denoted by B. The formula for magnetic flux density is Weber per metre square or Tesla. Mathematically ... the unit of magnetic flux density is Weber per metre square which is also called as Tesla.

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asked Aug 8, 2018 by anonymous

Define magnetic field strength and state its unit.

Last answer: Magnetic field strength is the force experienced by a unit N-pole when placed at any point in a magnetic field is known as magnetic field strength or magnetizing force. Magnetising force or magnetic field ... unit of length is metre. So the unit of magnetic field strength is ampere turns per metre.

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asked Aug 8, 2018 by anonymous

Define magnetic lines of force. Show the magnetic lines of force for bar type magnet.

Last answer: Magnetic linens of force is the imaginary lines for magnetic field of magnet around it. These magnetic lines of forces are introduced by Michael Faraday. The direction of lines of force is from N-pole to S-pole. The figure shows lines of force for bar type magnet.

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asked Jun 18, 2018 by anonymous

The magnetic susceptibility of paramagnetic material is:

The magnetic susceptibility of paramagnetic material is: A) Less than zero B) Less than one but positive C) Greater than one D) Equal to zero

Last answer: The magnetic susceptibility of paramagnetic material is: Less than one but positive

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asked Apr 29, 2018 by anonymous

Magnetic circuit breakers use _________

Magnetic circuit breakers use _________ A) Permanent magnets B) Earth magnets C) Solenoid D) All the above

Last answer: Magnetic circuit breakers use Solenoid

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asked Apr 29, 2018 by anonymous

Which of the following is a unit of magnetic flux?

Which of the following is a unit of magnetic flux? A) Weber B) Maxwell C) Both A and B D) None of these

Last answer: Which of the following is a unit of magnetic flux? A) Weber B) Maxwell C) Both A and B D) None of these

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asked Apr 29, 2018 by anonymous

What is the SI unit for magnetic reluctance?

What is the SI unit for magnetic reluctance? A) Ampere B) Ampere-turns per weber C) Henry D) None of these

Last answer: What is the SI unit for magnetic reluctance? A) Ampere B) Ampere-turns per weber C) Henry D) None of these

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asked Apr 29, 2018 by anonymous

Which of the following laws relates the magnetic field to the magnitude, direction, length, and proximity

Which of the following laws relates the magnetic field to the magnitude, direction, length, and proximity of the electric current? A) Lenz’s law B) Faraday’s law C) Biot–Savart law D) None of these

Last answer: Which of the following laws relates the magnetic field to the magnitude, direction, length, and proximity of the electric current? A) Lenz’s law B) Faraday’s law C) Biot–Savart law D) None of these

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asked Apr 29, 2018 by anonymous

The magnetic permeability of a diamagnet is _________

The magnetic permeability of a diamagnet is _________ A) More than that of vacuum B) Same as that of vacuum C) Less than that of vacuum D) 3.14 times that of vacuum

Last answer: The magnetic permeability of a diamagnet is Less than that of vacuum

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asked Apr 28, 2018 by anonymous

The magnetic neutral plane shifts in a dc machine

The magnetic neutral plane shifts in a dc machine (A) in the direction of motion of motor (B) in the direction of motion of generator (C) due to increase in the field flux (D) cause reduction of flash over between commutator segments

Last answer: The magnetic neutral plane shifts in a dc machine in the direction of motion of generator

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asked Apr 28, 2018 by anonymous

Which of the following statements is not characteristic of a static magnetic field?

Which of the following statements is not characteristic of a static magnetic field? (A) It is solenoidal. (B) It is conservative. (C) It has no sinks or sources. (D) Flux lines are always closed.

Last answer: Which of the following statements is not characteristic of a static magnetic field? (A) It is solenoidal. (B) It is conservative. (C) It has no sinks or sources. (D) Flux lines are always closed.

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1.4k views 1 answer