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

A. free

B. valence

C. bound

D. loose

Correct Answer :

A. free


Related Questions

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Whenever a flux inking a coil or current changesa an emf is induced in it. This is known as

A. Joule's Law

B. Coulomb's Law

C. Faraday's first law of electromagnetic induction

D. Faraday's second law of electromagnetic induction

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Who discovered the most important electrical effects which is the magnetic effect?

A. Hans Christian Oersted

B. Sir Charles Wheatstone

C. Georg Ohm

D. James Clerk Maxwell

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Permanent magnets can be found in

A. electric bells

B. earphones

C. relays

D. dy namic loudspeakers

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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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An alloy of 40 percent iron and 60 percent nickel.

A. Alnico

B. Permalloy

C. Hipernik

D. Manganin

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The magnetic flux through a coil changes. This results to the induced emf acting in a direction as to

A. Oppose the change

B. Aid the change

C. Either oppose or aid the change

D. Neither oppose nor aid the change

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__________ is a substance of whose molecules consist of the same kind of atom.

A. Mixture

B. Compound

C. Element

D. Isotope

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A law stating that the magnetic susceptibilities of most paramagnetic substances are inversely proportional to their absolute temperatures.

A. Curie's Law

B. Child's Law

C. CR Law

D. Curie-Weiss Law

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Materials that have very high permeabilities (hundreds and even thousands times of that of free space)

A. Paramagnetic

B. Non- magnetic

C. Ferromagnetic

D. Diamagnetic

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A 6- V battery is connected across a solenoid of 100 turns having a resistance of 2 ?a Calculate the number of ampere turns?

A.

B.

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The temperature coefficient of resistance of semiconductors is

A. positive

B. zero

C. negative

D. infinite

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States that the ratio of the thermal conductivity is proportional to the absolute temperature for all metals.

A. Wien's displacement law

B. Hartleys law

C. Hall's law

D. Wiedemann Franz law

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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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The force between two magnetic poles is _____ their poles strength.

A. equal to

B. directly proportional to

C. inversely proportional to

D. directly proportional to the square root of

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If the resistance of a material 2 m long and 2 m^2 in area of cross-section is 1.6 ×10^-8 ?a then its resistivity is

A. 3.2 × 10^-8 ?-m

B. 1.6 × 10^-8 ?-m

C. 0.64 × 10^-8 ?-m

D. 0.16 × 10^-8 ?-m

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The process by which an emf and hence current is generated or induced in a conductor when there is a change in the magnetic flux linking the conductor is called

A. Electromagnetic induction

B. Mutual induction

C. Faraday's law

D. Electromagnetic interference

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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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The force between two charges placed a given distance apart ______ as the relative permittivity of the medium is increased.

A. increases

B. decreases

C. remains unchanged

D. becomes infinite

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What bond is formed when one or more electrons in the outermost energy orbit of an atom are transferred to another?

A. Ionic

B. Covalent

C. Metallic

D. Van der Waals

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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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The resistance of a material is ____________ its area of cross-section.

A. directly proportional

B. independent of

C. inversely proportional to

D. equal to

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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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As the magnetic intensity decreasesa the relative permeability of a magnetic material

A. decreases

B. remains the same

C. increases

D. becomes zero

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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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The K shell or the first shell has how many permissible number of orbiting electrons?

A.

B.

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The relative permeability of a magnetic material is 10^5. What is its permeability?

A. 4 × 10^5 H/m

B. 4 × 10^-12 H/m

C. 4× 10^-2 H/m

D. 4 × 10^7H/m

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The unit of flux is _____ in cgs system.

A. Tesia

B. Gilbert

C. Maxwell

D. Oersted

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A factor used to correct for the electrostatic forces of the more distant ions in an ionic solid.

A. Avogadro's number

B. Planck's constant

C. Boltzmann's constant

D. Madelung constant

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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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Lenz' law states that the direction of the induced emf and hence current

A. Is determined by the rate of current flux

B. Is found by the right hand rule

C. Is found by the left hand rule

D. Always opposes the cause producing it