Related Questions
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Permeance is analogous to
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The simplest type of atom to exist is the ______ atom.
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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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The science of adapting electronics to aerospace flight.
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A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 × 10^-6
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How many electrons are needed in the valence orbit to give a material's stability?
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A current if flowing east along a power line. If the earth's field is neglecteda the direction of the magnetic field below it is
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Defined as a closed path in which magnetic induction or flux flows
D. Electromagnetic circuit
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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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The ratio of the total flux (flux in iron path) to the useful flux (flux in air gap)
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One electron volt (1 eV) is equivalent to _____ joules
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A good conductor has how many valence electrons?
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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
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Which of the following is a paramagnetic material?
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The core of a magnetic equipment uses a magnetic material with
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Temporary magnets are commonly employed in
C. moving coils loudspeakers
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What is the SI unit of specific resistance or resistivity?
A. Ohm-circular mil per inch
B. Ohm-circular mil per foot
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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 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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The hot resistance of an incandescent lamp is about _______ its cold resistance.
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The space outside the magnet where its pole have a force of attraction or repulsion on a magnetic pole is called
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What is used as the insulating material or dielectric in an electric ion
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The conduction of electricity across the surface of a dielectric is called
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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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Who developed the electromagnetic theory of light in 1862?
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The permeability of permalloy is
A. Very much greater than permeability of air
B. Slightly greater than permeability of air
C. Slightly less than permeability of air
D. Equal to the permeability of air
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Which of the following is a vector quantity?
B. Magnetic field intensity
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The straight line passing through the two poles of magnet is called
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All magnetic field originates from
A. moving electric charge
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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