Related Questions
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Which of the following electric quantities is vector in character?
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What is the relative permittivity of air?
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A magnetic circuit carries a flux iin the iron part and a fluxgin the air gap. What is the leakage coefficient?
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What type of bond is formed when there exists some form of collective interactions between the (negatively charged) electrons and (positively charged) nuclei in a solid?
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If the resistance of a material 2 m long and 2 m^2 in area of cross-section is 1.6 ×10^-8 ?a then its resistivity is
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The core of a transformer heats up when its primary is fed from an ac source because of
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What is the practical unit of electrical energy?
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The contribution to the ionization in an ionization chamber by electrons liberated from t he walls.
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The magnetic energy stored in an inductor is ______ current.
A. Directly proportional to
B. Inversely proportional to
C. Directly proportional to the square of
D. Inversely proportional to the square of
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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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One ampere- turn is equivalent to _____ gilberts
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The dielectric constant of most materials lies between
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An alloy of 22 percent iron and 78 per cent nickel.
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What is another name for relative permittivity?
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The air space between poles of magnets
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One weber of flux is equal to _______ magnetic lines of force.
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A substance that attracts pieces iron
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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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A factor used to correct for the electrostatic forces of the more distant ions in an ionic solid.
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Another term for corona discharge.
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A positively charged body has
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Three charges of +5 Ca -6 C and +9 C are placed inside a sphere. What is the total flux passing through the surface of sphere?
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The force acting on a unit n- pole placed at that point is called
A. Magnetic field intensity
B. Electric field intensity
C. Electromagnetic field intensity
D. Intensity magnetization
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The force between two magnetic poles is _____ their poles strength.
B. directly proportional to
C. inversely proportional to
D. directly proportional to the square root of
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The magnetic materials should have a large hysteresis loss for one of the following applications.
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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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Back emf refers to the
A. Current equal to the applied emf
C. Current opposing the applied emf
D. Voltage opposing the applied emf
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The greater percentage of materials is _________.
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Electronic current in a wire is the flow of ____________ electrons.
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If the length and area of cross-section of a wire are doubleda then its resistance