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What is the correct answer?

4

The permeability of permalloy is

A. Very much greater than permeability of air

B. Slightly greater than permeability of air

C. Slightly less than permeability of air

D. Equal to the permeability of air

Correct Answer :

A. Very much greater than permeability of air


Related Questions

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4

Magnetic fields do not interact with

A. Moving permanent magnets

B. Stationary permanent magnets

C. Moving electric charges

D. Stationary electric charges

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4

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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4

If the number of valence electrons of an atom is exactly 4a then the substance is called

A. a semiconductor

B. a conductor

C. an insulator

D. a cryogenic conductor

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4

Electric field intensity is measured in

A. volts/meter

B. Newton/meter

C. Newton-meter

D. Amperes/meter

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4

What is the measure of the density and sign of the electric charge at a point relative to that at some time?

A. Electric potential

B. Electric charge

C. Electric current

D. Electric intensity

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4

What determines the value of the temperature coefficient of resistance of a material?

A. length

B. cross-sectional area

C. volume

D. nature and temperature

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4

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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4

What is the SI unit of magnetic flux?

A. Tesla

B. Weber

C. Maxwell

D. Gauss

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4

The uncharged particles which have no effect on its atomic charge.

A. Nucleons

B. Electrons

C. Protons

D. Neutrons

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4

All magnetic field originates from

A. moving electric charge

B. Iron atoms

C. Magnetic domain

D. Permanent magnets

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4

What solid has no defined crystal structure except perhaps in the arrangement of the nearest neighboring atoms or ions?

A. Crystalline

B. Amorphous

C. Polycrystalline

D. Poly amorphous

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4

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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4

Electric lines of force leave or enter the charge surface at an angle of

A. 30o

B. 45 o

C. 90o

D. depending upon the angle of launch and entry

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4

Who discovered that a current-carrying conductor would move when placed in a magnetic field?

A. Michael Faraday

B. Andre Ampere

C. Hans Christian Oersted

D. Gustav Robert Kirchhoff

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4

Magnetic intensity is a

A. Phasor quantity

B. Physical quantity

C. Scalar quantity

D. Vector quantity

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4

A good conductor has how many valence electrons?

A.

B.

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4

What is the unit of reluctance?

A. Maxwell

B. Gauss

C. At/Wb

D. Weber

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4

When the relative permeability of a material is slightly more than 1a it is called ______ material.

A. diamagnetic

B. ferromagnetic

C. paramagnetic

D. non-magnetic

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4

The force acting on a unit n- pole placed at that point is called

A. Magnetic field intensity

B. Electric field intensity

C. Electromagnetic field intensity

D. Intensity magnetization

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4

Which of the following is a diamagnetic material?

A. Aluminum

B. Silver

C. Air

D. Cobalt

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4

Which of the following is a vector quantity?

A. Magnetic potential

B. Magnetic field intensity

C. Magnetic permeability

D. F lux density

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4

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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4

Used to maintain strength of magnetic field

A. Container

B. Air gap

C. Keeper

D. S ource

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4

Another term for corona discharge.

A. Lightning

B. Sparking

C. Aurora

D. Corona Effect

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4

When the relative permeability of a material is slightly less than 1a it is called _____ material.

A. diamagnetic

B. ferromagnetic

C. paramagnetic

D. non-magnetic

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4

The current of electric circuit is analogous to which quantity of a m

A. Mmf

B. Flux

C. Flux density

D. R eluctivity

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4

Defined as the number of lines per unit area through any substance in a plane at right angles to the lines of force

A. Flux

B. Flux lines

C. Flux density

D. Flux intensity

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4

Ohm's law can be used only to a _____ circuit or component.

A. Unilateral

B. Exponential

C. Trivalent

D. Linear

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4

The quantity 10^6 maxwells is equivalent to one

A. Weber

B. Gauss

C. Gilbert

D. Tesla

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4

An alloy of 40 percent iron and 60 percent nickel.

A. Alnico

B. Permalloy

C. Hipernik

D. Manganin