Related Questions
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The B-H curve for ________ is a straight line passing through the origin.
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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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If the value of 0 a conductor is 1/234 per oCa then the value of 18is
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The permeability of a material having a flux density of 5 Wb/m^2 is 10^-5 H/m. What is the value of magnetizing force?
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The greater percentage of materials is _________.
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The potential at a point due to a charge is 15 V. If the distance is times, the potential at the point will be
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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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The reluctance of a magnetic circuit varies with
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When the relative permeability of a material is much greater than 1a it is called _______ material.
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This paper does not exhibit electricity because it contains the same number of
B. neutrons and electrons
C. neutrons and positrons
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Materials that have very high permeabilities (hundreds and even thousands times of that of free space)
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An alloy of 40 percent iron and 60 percent nickel.
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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 ratio of the total flux (flux in iron path) to the useful flux (flux in air gap)
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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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The conduction of electricity across the surface of a dielectric is called
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The mass of proton is __________ the mass of an electron.
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A substance that attracts pieces iron
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What is the diameter of an atom?
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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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Residual magnetism refers to the flux densitya which exists in the iron core when the magnetic field intensity is
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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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What determines the value of the temperature coefficient of resistance of a material?
D. nature and temperature
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If the length and area of cross-section of a wire are doubleda then its resistance
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What is the typical saturation flux density for most magnetic materials?
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When the relative permeability of a material is slightly more than 1a it is called ______ material.
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The emf induced in a coil due to the change of its own flux linked with it is called
B. Dynamically induced emf
C. Statically induced emf
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______ is an electromagnet with its core in the form of a close magnetic ring.
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The permittivity of a material is given by one of the following formulas.
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A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 × 10^-6