Related Questions
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The unit of flux density is
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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 direction of force o a current carrying conductor placed in a m found by
B. Fleming's left hand rule
C. Fleming's right hand rule
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Which of the following electric quantities is vector in character?
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The force of attraction or repulsion between two magnetic poles is inversely proportional to the square of the distance between them. This is known as
B. Faraday's first law of electromagnetic induction
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When the ferromagnetic substance is inserted in a current- carrying solenoida the magnetic field is
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One of the solid structures in which the position of the atoms or ions are predetermined
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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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Permeance is analogous to
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The electric field intensity between the parallel plate air capacitor is 20 N/C. If an insulating slab of relative permittivity 5 is placed between the platesa then electric field intensity will be
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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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A law relating between the magnetic and electric susceptibilities and the absolute temperatures which is followed b ferromagnetsa antiferromagnetsa non-polar ferroelectricsa antiferroelectrics and some paramagnets.
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The total number of magnetic lines of force in a magnetic field is called
C. Magnetic flux intensity
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If you hold the conductor with right hand so that the stretched thumb points in the direction of the currenta then encircling fingers will give the direction of magnetic lines of force round the conductor. This is known as
A. Left hand cork screw rule
B. Right hand cork screw rule
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Steel is hard to magnetize because of its
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The physical motion resulting from the forces of magnetic fields is called
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Germanium atom has ______ protons and ______ electrons.
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The diameter of a hydrogen atom is approximately ______ cm.
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Temporary magnets are commonly employed in
C. moving coils loudspeakers
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What is the usual value of leakage coefficient for electrical machines?
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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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What determines the value of the temperature coefficient of resistance of a material?
D. nature and temperature
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The B-H curve of ________ is not a straight line.
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Electric potential is a _______ quantity.
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Flux density is measured in
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The current of electric circuit is analogous to which quantity of a m
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Gases whose particles are charged are known as
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What principle states that each electron in an atom must have a different set of quantum numbers?
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The property of a material which opposes the creation of magnetic flux in it