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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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A law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing the induction.
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How is mutual inductance between two coils decreased?
A. By using a common core
B. By moving the coils closer
C. By moving the coils apart
D. By increasing the number of turns of either coil
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When the relative permeability of a material is much greater than 1a it is called _______ material.
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Which of the following is used by permanent magnets as the magnetic material?
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Which of the following has the least number of valence electrons?
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The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known as
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A 200-watt lamp working for 24 hours will consume approximately _____ units.
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The force of attraction or repulsion between two magnetic poles is directly proportional to their strengths.
B. Faraday's first law of electromagnetic induction
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If the distance between two magnetic poles decreases by 2 timesa the force between them
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The resistivity of a conductor ___________ with an increase in temperature.
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The air space between poles of magnets
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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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Who discovered that a current-carrying conductor would move when placed in a magnetic field?
C. Hans Christian Oersted
D. Gustav Robert Kirchhoff
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The temperature coefficient of resistance of eureka is
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What is the SI unit of magnetic flux?
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The emf induced in a coil due to the changing current of another neighboring coil is called
C. Statically induced emf
D. Dynamically induced emf
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A commercial alloy of aluminum nickela and iron with cobalta copper and titanium added to produce about 12 grades.
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The phenomenon by which a magnetic substance becomes a magnet when it is place near a magnet
D. Electromagnetic induction
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Under ordinary conditionsa a body is considered
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In electro-mechanical conversion devices like generators and motors the reason why a small air gap is left between the rotor and stator is to
A. permit mechanical clearance
B. increase flux density in air gap
C. decrease the reluctance of magnetic path
D. complete the magnetic path
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A current if flowing east along a power line. If the earth's field is neglecteda the direction of the magnetic field below it 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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The physical motion resulting from the forces of magnetic fields is called
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The magnetic field of a bar magnet most closely resembles the magnetic field of
B. a straight current- carrying wire
C. a stream of electrons moving parallel to one another
D. a current- carrying wire loop
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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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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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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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Bonding of atoms that is due to the force of attraction between positive ions and a group of negative ions
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A theorem which states that an electric current flowing in a circuit produces a magnetic field at external points equivalent to that due to a magnetic shell whose bounding edge is the conductor and whose strength of the current.