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What is the correct answer?

4

The dielectric constant of most materials lies between

A. 1 and 10

B. 10 and 20

C. 20 and 50

D. 50 and 100

Correct Answer :

A. 1 and 10


Related Questions

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

A. Nucleons

B. Electrons

C. Protons

D. Neutrons

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The emission of electrons from hot bodies is called

A. Radiation effect

B. Edison effect

C. Skin effect

D. Half effect

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4

A current if flowing east along a power line. If the earth's field is neglecteda the direction of the magnetic field below it is

A. North

B. South

C. East

D. West

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The reluctance of the magnetic circuit is ________ relative permeability of the material comprising the circuit.

A. directly proportional to

B. inversely proportional to

C. independent of

D. dependent of

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4

What is the diameter of an atom?

A. About 10^-10 m

B. About 10^-10 cm

C. About 10^-10 mm

D. About 10^-10 �m

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4

Who demonstrated the theory of electromagnetic induction in 1831?

A. Michael Faraday

B. Andre Ampere

C. James Clerk Maxwell

D. Charles Coulomb

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4

What is another name for relative permittivity?

A. Dielectric strength

B. Electric intensity

C. Potential gradient

D. Dielectric constant

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A magnetizing force of 1000 AT/m will produce a flux density of __________ i

A. 1.257 mWb/m^2

B. 0.63 Wb/m^2

C. 1.257 Wb/m^2

D. 0.63 mWb/m^2

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4

Electrons at the outer shell are called

A. Outer shell electrons

B. Inner shell electrons

C. Semiconductor electrons

D. Valence electrons

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4

How many electrons are needed in the valence orbit to give a material's stability?

A.

B.

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4

If the value of 25 of a conductor is 1/230 per oCa then the value of 0is

A. 1/180 peroC

B. 1/150 per oC

C. 1/280 per oC

D. 1/230 per oC

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4

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

Electric field intensity at a point is numerically equal to ________ at that point.

A. potential gradient

B. potential difference

C. dielectric constant

D. the force

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If on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then the end under observation is a south pole. This is known as

A. Right hand rule

B. Left hand rule

C. Cork screw rule

D. End Rule

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4

A permanent magnet does not exert a force on

A. an unmagnetized iron bar

B. a magnetized iron bar

C. a moving electric charge

D. a stationary electric charge

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When the current flowsa the magnetic field ��. conductor is in what direction?

A. The same as the current direction

B. Opposite the current direction

C. Omnidirectional

D. In the direction determined by the left hand rule

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What is the unit of reluctance?

A. Maxwell

B. Gauss

C. At/Wb

D. Weber

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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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4

The unit of electrical energy is

A. Joule

B. Watt- second

C. Kilowatt hour

D. All of these

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4

The temperature coefficient of resistance of a conductor ______ with an increase in temperature.

A. increases

B. decreases

C. remains the same

D. becomes negative

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4

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

Electronic current in a wire is the flow of ____________ electrons.

A. free

B. valence

C. bound

D. loose

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An atom or a group of atoms that carries a net electric charge.

A. Positive ion

B. Negative ion

C. Ion

D. Electron

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Residual magnetism refers to the flux densitya which exists in the iron core when the magnetic field intensity is

A. Minimized

B. Reduced to zero

C. Maximize

D. Unity

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4

Amorphous solid is also called

A. Crystalline

B. Non- crystalline

C. Polycrystalline

D. Homogenous

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4

Who developed the electromagnetic theory of light in 1862?

A. Heinrich Rudolf Hertz

B. Wilhelm Rontgen

C. James Clerk Maxwell

D. Andre Ampere

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4

Electric potential is a _______ quantity.

A. scalar

B. phasor

C. vector

D. variable

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The permittivity of a material is given by one of the following formulas.

A. DE

B. E/D

C. D^2/E

D. D/E

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An alloy of 40 percent iron and 60 percent nickel.

A. Alnico

B. Permalloy

C. Hipernik

D. Manganin

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What is used as the dielectric material in high voltage transformers?

A. Mica

B. Paraffin

C. Porcelain

D. Oiled paper