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4

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

Correct Answer :

B. 0.5 Tesia of flux density


Related Questions

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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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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

What is the SI unit of conductance?

A. Siemens

B. Mhos

C. Ohms

D. 1/Ohms

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4

Core materials of a good relay have _________ hysteresis loop.

A. large

B. narrow

C. very large

D. very narrow

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4

The magnetic field of a bar magnet most closely resembles the magnetic field of

A. a horseshoe magnet

B. a straight current- carrying wire

C. a stream of electrons moving parallel to one another

D. a current- carrying wire loop

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4

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)

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4

Steel is hard to magnetize because of its

A. Low permeability

B. High permeability

C. High density

D. High retentivity

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4

A commercial alloy of aluminum nickela and iron with cobalta copper and titanium added to produce about 12 grades.

A. Alnico

B. Brass

C. Aluminum

D. Constantan

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4

Materials whose permeabilities are slightly greater than that of free space

A. Paramagnetic

B. Non- magnetic

C. Ferromagnetic

D. Diamagnetic

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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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4

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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4

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

A.

B.

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One oersted (Oe) is equivalent to _____ Gb/cm.

A.

B.

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The science of adapting electronics to aerospace flight.

A. Avionics

B. Aerotronics

C. Aerodynamics

D. Astrionics

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A negatively charge body has

A. deficit of electrons

B. excess of protons

C. excess of electrons

D. deficit of neutrons

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If you hold the conductor with right hand so that the stretched thumb points in the direction of the currenta then encircling fingers will give the direction of magnetic lines of force round the conductor. This is known as

A. Left hand cork screw rule

B. Right hand cork screw rule

C. Left hand rule

D. Right hand rule

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4

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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4

Which of the following is used by temporary magnets as the magnetic material?

A. Hardened steel

B. Cobalt steel

C. Soft iron

D. Tungsten steel

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4

A negative ion results when an atom gains an additional

A. Electron

B. Proton

C. Neutron

D. Atom

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The property of a material which opposes the creation of magnetic flux in it

A. Resistance

B. Reluctance

C. Permeance

D. Conductance

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What is the value of the absolute permittivity of air?

A. 8.854 F/m

B. 8.854 × 10^-12 mF/m

C. 8.854× 10^-12 F/m

D. 8.854 × 10^-12 F/m

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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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All matters (gasa liquid and solid) are composed of

A. Neutrons

B. Particles

C. Electrons

D. Atoms

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It is the reciprocal of reluctance and implies the case of readiness with which magnetic flux is developed.

A. R esistance

B. Conductance

C. Permeance

D. I nductance

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4

The temperature coefficient of resistance of conductors is

A. positive

B. zero

C. negative

D. infinite

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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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Ohm's law cannot be applied to which material?

A. Copper

B. Silver

C. Silicon carbide

D. Aluminum

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Who discovered superconductivity in 1911?

A. Kamerlingh Onnes

B. Alex Muller

C. GeoryBednorz

D. Charles Coulomb

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Referred to as the specific reluctance of a material

A. Resistivity

B. Reluctivity

C. Conductivity

D. Permeability

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Electric field intensity at a point due to a given charge ______ if the relative permittivity of the medium decreases.

A. decreases

B. remains unchanged

C. increases

D. b ecomes zero