Related Questions
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A law establishing the fact that the algebraic su of the rises and drops of the mmf around a closed loop of a magnetic circuit is equal to zero.
A. Kirchhoff's circuital law
B. Maxwell's circuital law
C. Ampere's circuital law
D. Coulomb's circuital law
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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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What is the SI unit of magnetic flux?
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All magnetic field originates from
A. moving electric charge
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A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 × 10^-6
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The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?
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The reluctance of a magnetic circuit is not dependent on which of the following?
A. Number of turns of coil
C. Flux density in the circuit
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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 magnetic potential in a magnetic circuit can be measured in terms of
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Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability of 126 x 10^-6 T/A.t/m
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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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What is the unit of magnetomotive force?
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Paramagnetic substance has a relative permeability of
A. Slightly less than one
D. Very much greater than one
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Cobalt is an example of a ______ material.
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Hipernik is an alloy containing __________ iron and __________ nickel.
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A magnetic field is
A. The current flow through space around a permanent magnet
B. The force set up when current flows through a conductor
C. The force that drives current through a resistor
D. The force between the plates of a charged capacitor
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Referred to as the specific reluctance of a material
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The emission of electrons from hot bodies is called
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The idea of preventing one component from affecting another through their common electric and magnetic field is referred to as
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The process by which an emf and hence current is generated or induced in a conductor when there is a change in the magnetic flux linking the conductor is called
A. Electromagnetic induction
D. Electromagnetic interference
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Whenever a conductor cuts magnetic fluxa an emf is induced in it. 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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A law stating that the magnetic susceptibilities of most paramagnetic substances are inversely proportional to their absolute temperatures.
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What is the SI unit of conductance?
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How many electrons are needed in the valence orbit to give a material's stability?
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The ability of a mechanically stressed ferromagnetic wire to recognize rapid switching of magnetization when subjected to a dc magnetic field.
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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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When the relative permeability of a material is slightly more than 1a it is called ______ material.
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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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One oersted (Oe) is equivalent to _____ Gb/cm.