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4

Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability of 126 x 10^-6 T/A.t/m

A. 0.252 G

B. 0.252 x 10^-2 T

C. 0.252 T

D. 0.252 x 10^-2 G

Correct Answer :

C. 0.252 T


Related Questions

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4

The magnetic potential in a magnetic circuit can be measured in terms of

A. Mmf

B. Emf

C. Farad

D. Coulomb

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4

If the value of 0 a conductor is 1/234 per oCa then the value of 18is

A. 1/218 per oC

B. 1/252 peroC

C. 1/272 per oC

D. 1/273 per oC

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4

Two similar polesa each 1Wba placed 1 m apart in air will experience a repulsive force of

A. 63000 N

B. 63 × 10^-3 N

C. 8 × 10^12 N

D. 796 kN

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4

At/m is a unit of

A. mmf

B. magnetic force

C. reluctance

D. magnetic flux density

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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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4

The straight line passing through the two poles of magnet is called

A. Real axis

B. Cartesian axis

C. Magnetic axis

D. Imaginary axis

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4

The magnetic field of a magnetized iron bar when strongly heated

A. Becomes weaker

B. Becomes stronger

C. Reverses in direction

D. is unchanged

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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

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4

What is the unit of magnetomotive force?

A. Volt

B. Tesla

C. Ampere- turn

D. Weber

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4

Permeance is analogous to

A. Conductance

B. Reluctance

C. Admittance

D. Resistance

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4

The force of attraction or repulsion between two magnetic poles is directly proportional to their strengths.

A. Newton's first law

B. Faraday's first law of electromagnetic induction

C. Coulomb's first law

D. Coulomb's second law

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4

An effect which is generally used in the gausameter to measure flux density.

A. Skin effect

B. Magnetic effect

C. Hall effect

D. Flywheel effect

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4

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

A.

B.

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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

The unit of flux density is

A. Wb/m

B. Tesla

C. At/m

D. N/Wb

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4

The hot resistance of an incandescent lamp is about _______ its cold resistance.

A. 10 times

B. 100 times

C. 5 times

D. 50 times

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4

Which of the following materials has the highest dielectric strength?

A. Glass

B. Oiled paper

C. Mica

D. Air

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4

The electric flux density is a ________ quantity.

A. phasor

B. vector

C. scalar

D. variable

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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

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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4

The force of attraction or repulsion between two magnetic poles is inversely proportional to the square of the distance between them. This is known as

A. Newton's first law

B. Faraday's first law of electromagnetic induction

C. Coulomb's first law

D. Coulomb's second law

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4

The ability of a mechanically stressed ferromagnetic wire to recognize rapid switching of magnetization when subjected to a dc magnetic field.

A. Wartheim effect

B. Wiedemann effect

C. Wiegand effect

D. Edison effect

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4

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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4

The quantity 10^6 maxwells is equivalent to one

A. Weber

B. Gauss

C. Gilbert

D. Tesla

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4

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

Under ordinary conditionsa a body is considered

A. positively charged

B. neutral

C. negatively charged

D. stable

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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

Cobalt is an example of a ______ material.

A. Paramagnetic

B. Diamagnetic

C. Ferromagnetic

D. Non- magnetic

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4

One farad equals

A. 1 coulomb/volt

B. 1 newton/coulomb

C. 1 newton-meter

D. 1 volt/second/ampere

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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