Related Questions
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What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5 x 10^-3 m^2?
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When the relative permeability of a material is slightly less than 1a it is called _____ material.
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The temperature coefficient of resistance of eureka is
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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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Two similar polesa each 1Wba placed 1 m apart in air will experience a repulsive force of
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__________ is a substance of whose molecules consist of the same kind of atom.
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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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Defined as the ratio of the volume occupied by the atoms or ions in a unit cell divided by the volume of the unit cell and is used to measure the compactness of a crystal.
A. Atomic packing factor (APF)
B. Ionic Packing Ratio (IPR)
C. Atomic compacting factor (ACF)
D. Ionic compacting ratio (ICR)
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The force which set ups or tends to set up magnetic flux in a magnetic circuit
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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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A good conductor has how many valence electrons?
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The straight line passing through the two poles of magnet is called
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What is the main advantage of temporary magnets?
A. The magnetic flux can be changed.
B. Hysteresis can be decreased.
C. Magnetic materials can be used.
D. Abundance of ferromagnetic material that can be temporarily magnetized.
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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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A magnetic flux of 2.5 x10^4 Wb through an area of 5 x10^4 square meters results in
B. 0.5 Tesia of flux density
D. 5000 Tesia of flux density
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The point in a magnet where the intensity of magnetic lines of force is maximum
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What revolves about the positive nucleus in a definite orbit?
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Who discovered the most important electrical effects which is the magnetic effect?
A. Hans Christian Oersted
B. Sir Charles Wheatstone
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The unit of electrical energy is
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The branch of Engineering which deals with the magnetic effect of electric current is known as
C. Electrical engineering
D. Electronics engineering
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An alloy of 40 percent iron and 60 percent nickel.
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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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Another term for corona discharge.
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The magnetic flux through a coil changes. This results to the induced emf acting in a direction as to
C. Either oppose or aid the change
D. Neither oppose nor aid the change
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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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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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Permeability means
A. The conductivity of the material for magnetic lines of force
B. The magnetization test in the material after exciting field has been removed
C. The strength of an electromagnet
D. The strength of the permanent magnet
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The temperature coefficient of resistance of insulators is
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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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The phenomenon by which a subtracts pieces of iron