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The ability of a mechanically stressed ferromagnetic wire to recognize rapid switching of magnetization when subjected to a dc magnetic field.

A. Wartheim effect

B. Wiedemann effect

C. Wiegand effect

D. Edison effect

Correct Answer :

C. Wiegand effect


Related Questions

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A theorem which states that an electric current flowing in a circuit produces a magnetic field at external points equivalent to that due to a magnetic shell whose bounding edge is the conductor and whose strength of the current.

A. Joule's law

B. Faraday's law

C. Volta's theorem

D. Ampere's theorem

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Which of the following is a natural magnet?

A. Steel

B. Magnesia

C. Lodestone

D. S oft iron

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Another term for corona discharge.

A. Lightning

B. Sparking

C. Aurora

D. Corona Effect

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What is the unit of magnetomotive force?

A. Volt

B. Tesla

C. Ampere- turn

D. Weber

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What is the unit of reluctance?

A. Maxwell

B. Gauss

C. At/Wb

D. Weber

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The energy stored in an electrostatic field or electromagnetic field is called

A. Electromagnetic energy

B. Kinetic energy

C. Potential energy

D. R est energy

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The magnetic flux through a wire loop in a magnetic field does not d

A. T he area of the loop

B. The magnitude of the field

C. The shape of the loop

D. The angle between the plane of the loop and the direction

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4

What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5 x 10^-3 m^2?

A. 6366 A, t/Wb

B. 6000 A, t/Wb

C. 8x10^-3 A, t/Wb

D. 0.8 A, t/Wb

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An electron- volt (eV) is a unit of

A. Energy

B. Potential difference

C. Charge

D. Momentum

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Hydrogen is an example of a _____ material.

A. Paramagnetic

B. Diamagnetic

C. Ferromagnetic

D. N on- magnetic

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A group of magnetically aligned atoms is called

A. Range

B. Lattice

C. Domain

D. Crystal

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The force between two magnetic poles is _______ their pole strengths.

A. directly proportional to

B. the sum of

C. inversely proportional to

D. the product of

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4

The core of a transformer heats up when its primary is fed from an ac source because of

A. permeability

B. ferromagnetism

C. reluctance of core

D. hysteresis loss

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The amount of magnetizing force to counter balance the resid magnetic material is referred to as

A. Reluctivity

B. Susceptivity

C. Coercivity

D. Retentivity

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Hysteresis loss can be reduced by one of the following.

A. Increasing mmf of the circuit

B. Using material narrow hysteresis loop

C. Using ferromagnetic core

D. Laminating the magnetic circuit

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If the length and area of cross-section of a wire are doubleda then its resistance

A. becomes four times

B. becomes sixteen times

C. remains the same

D. becomes two times

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The temperature coefficient of resistance of eureka is

A. p ositive

B. negative

C. almost zero

D. i nfinite

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The force between two magnetic poles varies with the distance between them. The variation is ______ to the square of that distance.

A. Equal

B. Greater than

C. Directly proportional

D. Inversely proportional

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The idea of preventing one component from affecting another through their common electric and magnetic field is referred to as

A. Hall effect

B. Grounding

C. Shielding

D. Limiting

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Which of the following materials has the least hysteresis loop area?

A. soft iron

B. silicon steel

C. hard steel

D. wrought iron

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A law relating between the magnetic and electric susceptibilities and the absolute temperatures which is followed b ferromagnetsa antiferromagnetsa non-polar ferroelectricsa antiferroelectrics and some paramagnets.

A. Curie's Law

B. Child's Law

C. CR Law

D. Curie-Weiss Law

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The flux density in an air-cored coil is 10^-3 Wb/m^2. With a cast iron core of relative permeability 100 inserteda the flux density will become

A. 10^-3 Wb/m^2

B. 10^-2 Wb/m^2

C. 10^3 Wb/m^2

D. 0.1 Wb/m^2

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The simplest type of atom to exist is the ______ atom.

A. Helium

B. Hydrogen

C. Boron

D. Oxygen

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Who discovereda the relationship between magnetism and electricity that serves as the foundation for the theory of electromagnetism?

A. Luigi Galvani

B. Hans Christian Oersted

C. Andre Ampere

D. Charles Coulomb

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Which of the following is a diamagnetic material?

A. Aluminum

B. Silver

C. Air

D. Cobalt

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The core of a magnetic equipment uses a magnetic material with

A. Least permeability

B. Low permeability

C. Moderate permeability

D. High permeability

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What principle states that each electron in an atom must have a different set of quantum numbers?

A. Inclusion principle

B. Exclusion principle

C. Quantum principle

D. Electron principle

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The ratio between the intensity of magnetization produced in a substance to the magnetizing force producing it

A. Magnetic Reluctivity

B. Magnetic Resistivity

C. Magnetic susceptibility

D. Magnetic conductivity

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Magnetic intensity is a

A. Phasor quantity

B. Physical quantity

C. Scalar quantity

D. Vector quantity

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Defined as the ratio of the volume occupied by the atoms or ions in a unit cell divided by the volume of the unit cell and is used to measure the compactness of a crystal.

A. Atomic packing factor (APF)

B. Ionic Packing Ratio (IPR)

C. Atomic compacting factor (ACF)

D. Ionic compacting ratio (ICR)