Related Questions
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The diameter of a hydrogen atom is approximately ______ cm.
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The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages. This is known as
B. Faraday's second law of electromagnetic induction
C. Faraday's first law of electromagnetic induction
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The lagging effect between flux density of the material and the magne
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One of the common application of an air- cored choke.
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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
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Hydrogen is an example of a _____ material.
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The simplest type of atom to exist is the ______ atom.
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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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The customary energy unit in atomic and nuclear physics is
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Ohm's law cannot be applied to which material?
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The emf induced in a coil due to the changing current of another neighboring coil is called
C. Statically induced emf
D. Dynamically induced emf
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The energy stored in an electrostatic field or electromagnetic field is called
A. Electromagnetic energy
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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 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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Germanium atom has ______ protons and ______ electrons.
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A magnetizing force of 1000 AT/m will produce a flux density of __________ i
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The unit of electrical energy is
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What is the other name for dielectric strength?
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Used to maintain strength of magnetic field
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The point in a magnet where the intensity of magnetic lines of force is maximum
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A commercial alloy of aluminum nickela and iron with cobalta copper and titanium added to produce about 12 grades.
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The ratio of the permeability of material to the permiabiity of air or vacuum.
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Defined as the number of lines per unit area through any substance in a plane at right angles to the lines of force
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Theory of ferromagnetic phenomena which assumes each atom is a permanent magnet which can turn freely about its center under the influence of applied field and other magnets.
A. Ewing's theory of ferromagnetism
B. Oersted's ferromagnetism theory
C. Maxwell's magnetic theory
D. Ampere's circuital law
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The hot resistance of an incandescent lamp is about _______ its cold resistance.
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In electro-mechanical conversion devices like generators and motors the reason why a small air gap is left between the rotor and stator is to
A. permit mechanical clearance
B. increase flux density in air gap
C. decrease the reluctance of magnetic path
D. complete the magnetic path
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What is the SI unit of conductivity?
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An electron- volt (eV) is a unit of
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The contribution to the ionization in an ionization chamber by electrons liberated from t he walls.
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A test charge means a charge of