Related Questions
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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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If the relative permittivity of a material is 10a then its permittivity 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 magnetic flux of 2000 lines is how many Maxwells?
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The induced emf in a wire loop that is moved parallel to a uniform magnetic field is
B. Dependent on the area of the loop
C. Dependent on the shape of the loop
D. Dependent on the magnitude of the field
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The magnetic field of a magnetized iron bar when strongly heated
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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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A 200-watt lamp working for 24 hours will consume approximately _____ units.
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The magnetic field inside a solenoid
C. increases with distance from the axis
D. decreases with distance from the axis
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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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Refers to the magnetic lines
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The B-H curve of ________ is not a straight line.
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The temperature coefficient of resistance of semiconductors is
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The resistivity of a conductor ___________ with an increase in temperature.
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One of the common application of an air- cored choke.
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When the ferromagnetic substance is inserted in a current- carrying solenoida the magnetic field is
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If the value of 25 a conductor is 1/255 per oCa then the value of 20is
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Lenz's law is the consequence of the law of conservation of
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If the distance between two magnetic poles decreases by 2 timesa the force between them
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When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every _______ revolution
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What is the SI unit of specific resistance or resistivity?
A. Ohm-circular mil per inch
B. Ohm-circular mil per foot
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When the current flowsa the magnetic field ��. conductor is in what direction?
A. The same as the current direction
B. Opposite the current direction
D. In the direction determined by the left hand rule
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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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Materials whose permeabilities are slightly greater than that of free space
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What revolves about the positive nucleus in a definite orbit?
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Hysteresis loss can be reduced by one of the following.
A. Increasing mmf of the circuit
B. Using material narrow hysteresis loop
C. Using ferromagnetic core
D. Laminating the magnetic circuit
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The energy stored in an electrostatic field or electromagnetic field is called
A. Electromagnetic energy
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Refers to the non- metallic materials that have the ferromagnetic properties of iron.
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One weber of flux is equal to _______ magnetic lines of force.
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What is the diameter of an atom?