Related Questions
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The evaporation of electrons from a heated surface is called
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Magnetic effects of the earth as a huge magnet with north and south poles.
D. Terrestrial ferromagnetism
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If the value of 25 of a conductor is 1/230 per oCa then the value of 0is
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One oersted (Oe) is equivalent to _____ Gb/cm.
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When the relative permeability of a material is much greater than 1a it is called _______ material.
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The temperature coefficient of resistance of conductors is
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The branch of Engineering which deals with the magnetic effect of electric current is known as
C. Electrical engineering
D. Electronics engineering
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Residual magnetism refers to the flux densitya which exists in the iron core when the magnetic field intensity is
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If the number of valence electrons of an atom is exactly 4a then the substance is called
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Which of the following has the least number of valence electrons?
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As the magnetic intensity decreasesa the relative permeability of a magnetic material
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A law relating between the magnetic and electric susceptibilities and the absolute temperatures which is followed b ferromagnetsa antiferromagnetsa non-polar ferroelectricsa antiferroelectrics and some paramagnets.
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A germanium atom has an atomic weight of72. How many neutrons are there?
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Hysteresis refers to the ______ between flux density of the material and the magnetizing force applied.
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The reluctance of a magnetic circuit is not dependent on which of the following?
A. Number of turns of coil
C. Flux density in the circuit
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The ratio of the total flux (flux in iron path) to the useful flux (flux in air gap)
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When a conductor is stationary and the magnetic field is moving or changing the emf induced is called
A. Statically induced emf
D. Dynamically induced emf
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The mass of proton is __________ the mass of an electron.
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Which of the following is a vector quantity?
B. Magnetic field intensity
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The permittivity of a material is given by one of the following formulas.
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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
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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
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What solid has no defined crystal structure except perhaps in the arrangement of the nearest neighboring atoms or ions?
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How many turns are needed to produce a magnetomotive force of 1000 A.t for a coil with 6 amperes?
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Electromotive force in a circuit
A. causes free electrons to flow
B. increases the circuit resistance
C. maintains circuit resistance
D. is needed to make the circuit complete
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Materials whose permeabilities are slightly greater than that of free space
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If a 20 V potential is applied across a relay coil with 50 turns having 1 ? of resistancea the total magnetomotive producing magnetic flux in the circuit is
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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
D. Law of conservation of energy
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How is mutual inductance between two coils decreased?
A. By using a common core
B. By moving the coils closer
C. By moving the coils apart
D. By increasing the number of turns of either coil
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One of the common application of an air- cored choke.