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An atom or a group of atoms that carries a net electric charge.
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Used to maintain strength of magnetic field
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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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The force acting on a unit n- pole placed at that point is called
A. Magnetic field intensity
B. Electric field intensity
C. Electromagnetic field intensity
D. Intensity magnetization
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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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Which of the following has the highest permeability?
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If the length and area of cross-section of a wire are doubleda then its resistance
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If two similar charges 1 coulomb each are placed 1 m apart in aira then the force of repulsion is
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A magnetic material losses its ferromagnetic properties at a point called
B. Inferred absolute temperature
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The relation between absolute permittivity of air ( 0)a absolute p and velocity of light (c) is given by
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A principle that states that only two electrons with different spins are allowed to exist in a given orbit
B. Pauli exclusion principle
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Two similar polesa each 1Wba placed 1 m apart in air will experience a repulsive force of
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What is the typical saturation flux density for most magnetic materials?
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The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known as
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What is the SI unit of reluctance?
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The science of adapting electronics to aerospace flight.
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Referred to as the specific reluctance of a material
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The unit of flux is _____ in cgs system.
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There are how many compounds available in nature?
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Steel is hard to magnetize because of its
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If on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then the end under observation is a south pole. This is known as
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A good conductor has how many valence electrons?
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Materials whose permeabilities are slightly greater than that of free space
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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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A one cubic cm of copper has how many free electrons at room temperature?
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Which of the following has the least number of valence electrons?
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If the resistance of a material 2 m long and 2 m^2 in area of cross-section is 1.6 ×10^-8 ?a then its resistivity is
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The branch of Engineering which deals with the magnetic effect of electric current is known as
C. Electrical engineering
D. Electronics engineering
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Which element has four valence electrons?
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What is the SI unit of conductance?