Related Questions
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The tiniest element of matter
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Hysteresis refers to the ______ between flux density of the material and the magnetizing force applied.
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One that has magnetic poles produced by internal atomic structure with no external current necessary
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The magnetic field around the conductor is determined by the
C. Current divided by the resistance
D. Resistance divided by the current
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The phenomenon by which a subtracts pieces of iron
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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
B. Faraday's first law of electromagnetic induction
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Electric potential is a _______ quantity.
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A law establishing the fact that the algebraic su of the rises and drops of the mmf around a closed loop of a magnetic circuit is equal to zero.
A. Kirchhoff's circuital law
B. Maxwell's circuital law
C. Ampere's circuital law
D. Coulomb's circuital law
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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 reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5 x 10^-3 m^2?
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One oersted (Oe) is equivalent to _____ Gb/cm.
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Who developed the electromagnetic theory of light in 1862?
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A negative ion results when an atom gains an additional
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Lenz' law states that the direction of the induced emf and hence current
A. Is determined by the rate of current flux
B. Is found by the right hand rule
C. Is found by the left hand rule
D. Always opposes the cause producing it
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The flux density in an air-cored coil is 10^-3 Wb/m^2. With a cast iron core of relative permeability 100 inserteda the flux density will become
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If the distance between two magnetic poles decreases by 2 timesa the force between them
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What is the typical saturation flux density for most magnetic materials?
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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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What is the practical unit of electrical energy?
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Permeance of a magnetic circuit is _________ the cross-sectional area of the circuit.
A. directly proportional to
B. inversely proportional to
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What is the SI unit of conductivity?
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One electron volt (1 eV) is equivalent to _____ joules
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A law stating that the magnetic susceptibilities of most paramagnetic substances are inversely proportional to their absolute temperatures.
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Magnetic fields do not interact with
A. Moving permanent magnets
B. Stationary permanent magnets
C. Moving electric charges
D. Stationary electric charges
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When the relative permeability of a material is much greater than 1a it is called _______ material.
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A law that states that the current in a thermionic diode varies directly with the three- halves power of anode voltage and inversely with the square of the distance between the electrodesa provided operating conditions are such that the current is limited only by the space charge.
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The phenomenon that when an electric current passes through an anisotropic crystala there is an absorption or liberation of heat due to the non-uniformity in current distribution.
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The temperature coefficient of resistance of eureka is
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What determines the atomic number of an element?
B. The number of electrons
C. The number of neutrons
D. The number of neutrons and protons
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Core materials of a good relay have _________ hysteresis loop.