Related Questions
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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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If the magnetic material is located within a coil through which alternating current (60 Hz frequency) flowsa then __________ hysteresis loops will be formed
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Materials whose permeabilities are slightly greater than that of free space
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What is the SI unit of conductivity?
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An alloy of 40 percent iron and 60 percent nickel.
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A permanent magnet does not exert a force on
A. an unmagnetized iron bar
C. a moving electric charge
D. a stationary electric charge
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How many neutrons does a copper atom have?
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The reluctance of a magnetic circuit varies with
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One of the common application of an air- cored choke.
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The unit of flux density is
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What is the SI unit of conductance?
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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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Core materials of a good relay have _________ hysteresis loop.
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When a current carrying conductor is placed in a magnetic fielda the maximum force will act on the conductor when the conductor is at an angle of _______ to the magnetic field.
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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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When a conductor is stationary and the magnetic field is moving or changing the emf induced is called
A. Statically induced emf
D. Dynamically induced emf
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What is the usual value of leakage coefficient for electrical machines?
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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 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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If the right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in the direction of current flow, the motion of its handle will indicate the direction of magnetic flux produced around the conductor. This is known as
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What is the SI unit of magnetic flux?
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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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One weber of flux is equal to _______ magnetic lines of force.
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Electric potential is a _______ quantity.
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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 is the SI unit of reluctance?
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Who developed the electromagnetic theory of light in 1862?
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Whenever a flux inking a coil or current changesa an emf is induced in it. This is known as
C. Faraday's first law of electromagnetic induction
D. Faraday's second law of electromagnetic induction
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Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying conductors can attract and repel each other just like magnets?
B. Hans Christian Oersted
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Cobalt is an example of a ______ material.