Related Questions
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One that has magnetic poles produced by internal atomic structure with no external current necessary
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The hot resistance of an incandescent lamp is about _______ its cold resistance.
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Which of the following statements is TRUE?
A. Silicon dioxide is a good
B. The current carriers in conductors are valence electrons
C. For conductorsa the valence electron are strongly attracted to the nucleus
D. The valence electrons are located in the nucleus of an atom
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4
Electronic current in a wire is the flow of ____________ electrons.
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If the number of valence electrons of an atom is less than 4a then the substance is probably
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What is used as the insulating material or dielectric in an electric ion
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If the value of 25 a conductor is 1/255 per oCa then the value of 20is
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The amount of magnetizing force to counter balance the resid magnetic material is referred to as
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The dielectric constant of most materials lies between
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Which of the following is a natural magnet?
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The mass of proton is __________ the mass of an electron.
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The straight line passing through the two poles of magnet is called
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The uncharged particles which have no effect on its atomic charge.
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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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One weber of flux is equal to _______ magnetic lines of force.
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Which of the following has the least number of valence electrons?
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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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The electric flux density is a ________ quantity.
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If the relative permittivity of a material is 10a then its permittivity is
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Temporary magnets are commonly employed in
C. moving coils loudspeakers
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Steel is hard to magnetize because of its
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Formed when there exist distant electronic interactions between (opposite) charges present in the neighboring atoms or molecules.
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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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What is the SI unit of reluctance?
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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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Which element has four valence electrons?
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Why is it that the magnitude of magnetomotive force required for air gap is much greater than that required for iron part of a magnetic circuit?
B. Because air has the highest relative permeability
C. Because air is a conductor of magnetic flux
D. Because air has the lowest relative permeability
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A magnetic field is
A. The current flow through space around a permanent magnet
B. The force set up when current flows through a conductor
C. The force that drives current through a resistor
D. The force between the plates of a charged capacitor
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The customary energy unit in atomic and nuclear physics is
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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.