Related Questions
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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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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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If the number of valence electrons of an atom is more than 4a the substance is called
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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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If a magnetic flux cuts across 200 turns at a rate of 2Wb/sa the induced voltage according to Faraday's law is about
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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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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 diameter of an atom?
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The magnetic potential in a magnetic circuit can be measured in terms of
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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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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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The amount of magnetizing force to counter balance the resid magnetic material is referred to as
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Calculate the permeability (in T/A. t/m) of a magnetic material that has a relative permeability of 300
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As the magnetic intensity decreasesa the relative permeability of a magnetic material
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Which of the following materials has permeability slightly less than that of free space?
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Hydrogen is an example of a _____ material.
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The K shell or the first shell has how many permissible number of orbiting electrons?
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One farad equals
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The temperature coefficient of resistance of semiconductors is
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The dielectric constant of most materials lies between
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This paper does not exhibit electricity because it contains the same number of
B. neutrons and electrons
C. neutrons and positrons
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A magnetic material losses its ferromagnetic properties at a point called
B. Inferred absolute temperature
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How many electrons are needed in the valence orbit to give a material's stability?
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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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What bond is formed when one or more electrons in the outermost energy orbit of an atom are transferred to another?
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One ampere- turn is equivalent to _____ gilberts
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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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The reluctance of a magnetic circuit varies with
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The physical motion resulting from the forces of magnetic fields is called
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The diameter of a hydrogen atom is approximately ______ cm.