Related Questions
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The hot resistance of an incandescent lamp is about _______ its cold resistance.
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The temperature coefficient of resistance of eureka is
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The magnetic field of a bar magnet most closely resembles the magnetic field of
B. a straight current- carrying wire
C. a stream of electrons moving parallel to one another
D. a current- carrying wire loop
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Residual magnetism refers to the flux densitya which exists in the iron core when the magnetic field intensity is
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Magnetic field intensity is a ________ quantity.
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Formed when there exist distant electronic interactions between (opposite) charges present in the neighboring atoms or molecules.
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The force between two magnetic poles is _______ their pole strengths.
A. directly proportional to
C. inversely proportional to
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Which of the following materials has the least hysteresis loop area?
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If the distance between two magnetic poles decreases by 2 timesa the force between them
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The energy stored in an electrostatic field or electromagnetic field is called
A. Electromagnetic energy
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If the value of 0 a conductor is 1/234 per oCa then the value of 18is
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One that has magnetic poles produced by internal atomic structure with no external current necessary
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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
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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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The magnetic flux of 2000 lines is how many Maxwells?
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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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Electric field intensity at a point due to a given charge ______ if the relative permittivity of the medium decreases.
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An alloy of 40 percent iron and 60 percent nickel.
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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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If the number of valence electrons of an atom is less than 4a then the substance is probably
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A test charge means a charge of
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As the magnetic intensity decreasesa the relative permeability of a magnetic material
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Which of the following is a paramagnetic material?
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The permeability of a material having a flux density of 5 Wb/m^2 is 10^-5 H/m. What is the value of magnetizing force?
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The force between two magnetic poles varies with the distance between them. The variation is ______ to the square of that distance.
D. Inversely proportional
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What is the SI unit of reluctance?
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An atom or a group of atoms that carries a net electric charge.
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A positively charged body has
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One ampere- turn is equivalent to _____ gilberts
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The resistance of a material is ____________ its area of cross-section.
C. inversely proportional to