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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

Correct Answer :

C. Potential energy


Related Questions

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Whenever a conductor cuts magnetic fluxa an emf is induced in it. This is known as

A. Coulomb's law

B. Joule's law

C. Faraday's law

D. Ohm's law

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4

The net electrical charge in an isolated system remains constant. This is known as

A. Law of conservation of charge

B. Coulomb's first law

C. Coulomb's second law

D. Law of conservation of energy

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4

What is the practical unit of electrical energy?

A. Watt

B. Kilowatt-hour

C. Kilowatt-second

D. Megawathour

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4

Flux linkages equals

A. Flux times area of core

B. Flux times number of turns times area of core

C. Flux times number of turns times length of core

D. Flux times number of turns

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4

Germanium atom has ______ protons and ______ electrons.

A. 32, 32

B. 32, 42

C. 42, 32

D. 34, 34

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What is the main advantage of temporary magnets?

A. The magnetic flux can be changed.

B. Hysteresis can be decreased.

C. Magnetic materials can be used.

D. Abundance of ferromagnetic material that can be temporarily magnetized.

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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

A germanium atom has an atomic weight of72. How many neutrons are there?

A.

B.

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Electron is a Greek word for

A. amber

B. Fire

C. Stone

D. Heat

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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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4

The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium of relative permittivity of 3a then electric potential at that point will be

A. 63 V

B. 21 V

C. 7 V

D. 42 V

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4

When a current carrying conductor is placed in a magnetic fielda the maximum force will act on the conductor when the conductor is at an angle of _______ to the magnetic field.

A. 45o

B. 60o

C. 30o

D. 90o

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4

The relation between absolute permittivity of air ( 0)a absolute p and velocity of light (c) is given by

A. 0 0= c^2

B. 0 0= c

C. 1/ 0 0= c

D. 1/ 0 0= c^2

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4

What is the SI unit of reluctance?

A. At

B. At/m

C. N/Wb

D. At/Wb

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What is the other name for dielectric strength?

A. Breakdown voltage

B. Electric intensity

C. Potential gradient

D. Dielectric constant

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4

How many neutrons does a copper atom have?

A.

B.

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Paramagnetic substance has a relative permeability of

A. Slightly less than one

B. Equal to one

C. Slightly equal to one

D. Very much greater than one

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A magnetic flux of 2.5 x10^4 Wb through an area of 5 x10^4 square meters results in

A. 5 Wb

B. 0.5 Tesia of flux density

C. 5x 10^-5 Wb of flux

D. 5000 Tesia of flux density

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The science of adapting electronics to aerospace flight.

A. Avionics

B. Aerotronics

C. Aerodynamics

D. Astrionics

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Which of the following electric quantities is vector in character?

A. Field

B. Charge

C. Energy

D. Potential Difference

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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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Which of the following is a diamagnetic material?

A. Aluminum

B. Silver

C. Air

D. Cobalt

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Which of the following has the least number of valence electrons?

A. Conductor

B. Semiconductor

C. Insulator

D. Semi- insulator

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Calculate the permeability (in T/A. t/m) of a magnetic material that has a relative permeability of 300

A. 3.78 x 10^4

B. 3.78 x 10^-5

C. 3.78 x 10^-3

D. 3.78 x 10^-6

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What is another name for relative permittivity?

A. Dielectric strength

B. Electric intensity

C. Potential gradient

D. Dielectric constant

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4

Defined as the flux density produced in it due to its own induced magnetism

A. Magnetic field intensity

B. Electric field intensity

C. Electromagnetic field intensity

D. Intensity magnetization

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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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The magnetic field around the conductor is determined by the

A. Size of the conductor

B. Amount of current

C. Current divided by the resistance

D. Resistance divided by the current

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The ability of a material to conduct magnetic flux through it.

A. Permittivity

B. Reluctivity

C. Conductivity

D. 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