Related Questions
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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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Electrons at the outer shell are called
C. Semiconductor electrons
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The unit of flux density is
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The space outside the magnet where its pole have a force of attraction or repulsion on a magnetic pole is called
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What is the usual value of leakage coefficient for electrical machines?
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The force between two magnetic poles is _______ their pole strengths.
A. directly proportional to
C. inversely proportional to
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The relative permeability of a magnetic material is 10^5. What is its permeability?
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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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Define as that pole which when placed in air from a similar and equal pole repels it with a force of newtons
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Who demonstrated the theory of electromagnetic induction in 1831?
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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 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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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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What is the unit of magnetomotive force?
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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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If on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then the end under observation is a south pole. This is known as
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Core materials of a good relay have _________ hysteresis loop.
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If the solenoid is gripped by the right hand with the fingers pointing the direction of current flowa the outstretched thumb will then point the north pole. This is known as
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The B-H curve of ________ is not a straight line.
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If the number of valence electrons of an atom is less than 4a the substance is called
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If a 20 V potential is applied across a relay coil with 50 turns having 1 ? of resistancea the total magnetomotive producing magnetic flux in the circuit is
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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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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 specific resistance or resistivity?
A. Ohm-circular mil per inch
B. Ohm-circular mil per foot
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Electric field intensity at a point due to a given charge ______ if the relative permittivity of the medium decreases.
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The mass of proton is __________ the mass of an electron.
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The physical motion resulting from the forces of magnetic fields is called
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Defined as a closed path in which magnetic induction or flux flows
D. Electromagnetic circuit
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If the number of valence electrons of an atom is more than 4a the substance is called