Related Questions
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Back emf refers to the
A. Current equal to the applied emf
C. Current opposing the applied emf
D. Voltage opposing the applied 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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Defined as a closed path in which magnetic induction or flux flows
D. Electromagnetic circuit
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There are how many compounds available in nature?
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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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4
The magnetic field inside a solenoid
C. increases with distance from the axis
D. decreases with distance from the axis
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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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A one cubic cm of copper has how many free electrons at room temperature?
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When the relative permeability of a material is slightly less than 1a it is called _____ material.
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The core of a magnetic equipment uses a magnetic material with
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Materials whose permeabilities are slightly greater than that of free space
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A magnetic material losses its ferromagnetic properties at a point called
B. Inferred absolute temperature
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Permeance of a magnetic circuit is _________ the cross-sectional area of the circuit.
A. directly proportional to
B. inversely proportional to
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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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4
The permeability of permalloy is
A. Very much greater than permeability of air
B. Slightly greater than permeability of air
C. Slightly less than permeability of air
D. Equal to the permeability of air
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4
A magnetic flux of 2.5 x10^4 Wb through an area of 5 x10^4 square meters results in
B. 0.5 Tesia of flux density
D. 5000 Tesia of flux density
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What is used as the insulating material or dielectric in an electric ion
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The energy stored in an electrostatic field or electromagnetic field is called
A. Electromagnetic energy
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The magnetic materials should have a large hysteresis loss for one of the following applications.
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What is the SI unit of reluctance?
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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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The lagging effect between flux density of the material and the magne
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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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The straight line passing through the two poles of magnet is called
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A 6- V battery is connected across a solenoid of 100 turns having a resistance of 2 ?a Calculate the number of ampere turns?
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Hydrogen is an example of a _____ material.
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Who discovereda the relationship between magnetism and electricity that serves as the foundation for the theory of electromagnetism?
B. Hans Christian Oersted
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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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Electronic current in a wire is the flow of ____________ electrons.