Related Questions
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Refers to the non- metallic materials that have the ferromagnetic properties of iron.
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Used to maintain strength of magnetic field
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The induced emf in a wire loop that is moved parallel to a uniform magnetic field is
B. Dependent on the area of the loop
C. Dependent on the shape of the loop
D. Dependent on the magnitude of the field
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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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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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A 200-watt lamp working for 24 hours will consume approximately _____ units.
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The B-H curve for ________ is a straight line passing through the origin.
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A factor used to correct for the electrostatic forces of the more distant ions in an ionic solid.
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Cobalt is an example of a ______ material.
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Germanium atom has ______ protons and ______ electrons.
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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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What is the unit of reluctance?
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What is used as the insulating material or dielectric in an electric ion
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The property of a material which opposes the creation of magnetic flux in it
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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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Materials that have very high permeabilities (hundreds and even thousands times of that of free space)
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When the relative permeability of a material is slightly less than 1a it is called _____ material.
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What is the measure of the density and sign of the electric charge at a point relative to that at some time?
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The magnetic potential in a magnetic circuit can be measured in terms of
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Hysteresis loss can be reduced by one of the following.
A. Increasing mmf of the circuit
B. Using material narrow hysteresis loop
C. Using ferromagnetic core
D. Laminating the magnetic circuit
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A substance that attracts pieces iron
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How many turns are needed to produce a magnetomotive force of 1000 A.t for a coil with 6 amperes?
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What is the unit of magnetomotive force?
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What is the SI unit of conductance?
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The flux density in an air-cored coil is 10^-3 Wb/m^2. With a cast iron core of relative permeability 100 inserteda the flux density will become
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A one cubic cm of copper has how many free electrons at room temperature?
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Electromotive force in a circuit
A. causes free electrons to flow
B. increases the circuit resistance
C. maintains circuit resistance
D. is needed to make the circuit complete
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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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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 quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force is called