Related Questions
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What is the maximum number of electrons that can be accommodated in the last orbit of an atom?
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States that the ratio of the thermal conductivity is proportional to the absolute temperature for all metals.
A. Wien's displacement law
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The electrons in the last orbit of an atom are called _______ electrons.
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Flux linkages equals
A. Flux times area of core
B. Flux times number of turns times area of core
C. Flux times number of turns times length of core
D. Flux times number of turns
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When the ferromagnetic substance is inserted in a current- carrying solenoida the magnetic field is
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When the relative permeability of a material is slightly less than 1a it is called _____ material.
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Hysteresis is a phenomenon of _________ in a magnetic circuit.
A. setting up constant flux
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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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The magnetic field of a magnetized iron bar when strongly heated
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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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If the distance between two magnetic poles decreases by 2 timesa the force between them
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If the number of valence electrons of an atom is less than 4a the substance is called
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A negative ion results when an atom gains an additional
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A test charge means a charge of
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Which of the following is a paramagnetic material?
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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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The force which set ups or tends to set up magnetic flux in a magnetic circuit
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The space outside the magnet where its pole have a force of attraction or repulsion on a magnetic pole is called
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Refers to the magnetic lines
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The resistance of a material is ____________ its area of cross-section.
C. inversely proportional to
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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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The greater percentage of materials is _________.
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Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying conductors can attract and repel each other just like magnets?
B. Hans Christian Oersted
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The force between two magnetic poles is _____ their poles strength.
B. directly proportional to
C. inversely proportional to
D. directly proportional to the square root of
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The straight line passing through the two poles of magnet is called
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Defined as the number of lines per unit area through any substance in a plane at right angles to the lines of force
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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 the SI unit of conductance?
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The simplest type of atom to exist is the ______ atom.
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The conduction of electricity across the surface of a dielectric is called