Related Questions
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All matters (gasa liquid and solid) are composed of
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Electric field intensity is a ________.
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The reluctance of a magnetic circuit varies with
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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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Which of the following is a natural magnet?
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Temporary magnets are commonly employed in
C. moving coils loudspeakers
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How many turns are needed to produce a magnetomotive force of 1000 A.t for a coil with 6 amperes?
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A substance that attracts pieces iron
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The magnetic field around the conductor is determined by the
C. Current divided by the resistance
D. Resistance divided by the current
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Under ordinary conditionsa a body is considered
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The emf induced in a coil due to the change of its own flux linked with it is called
B. Dynamically induced emf
C. Statically induced emf
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The current of electric circuit is analogous to which quantity of a m
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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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When the relative permeability of a material is much greater than 1a it is called _______ material.
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Materials that have very high permeabilities (hundreds and even thousands times of that of free space)
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Permanent magnets can be found in
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How many electrons are needed in the valence orbit to give a material's stability?
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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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The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium of relative permittivity of 3a then electric potential at that point will be
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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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What is the diameter of an atom?
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The uncharged particles which have no effect on its atomic charge.
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The evaporation of electrons from a heated surface is called
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The energy stored in an electrostatic field or electromagnetic field is called
A. Electromagnetic energy
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The temperature coefficient of resistance of a conductor ______ with an increase in temperature.
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Bonding of atoms that is due to the force of attraction between positive ions and a group of negative ions
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A magnetic circuit carries a flux iin the iron part and a fluxgin the air gap. What is the leakage coefficient?
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One oersted (Oe) is equivalent to _____ Gb/cm.
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An electron- volt (eV) is a unit of
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The force between two magnetic poles is _____ the relative permeability of the medium.
A. directly proportional to
C. inversely proportional to