The physical motion resulting from the forces of magnetic fields is called
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If two similar charges 1 coulomb each are placed 1 m apart in aira then the force of repulsion is
If the number of valence electrons of an atom is exactly 4a then the substance is called
The property of a material which opposes the creation of magnetic flux in it
Residual magnetism refers to the flux densitya which exists in the iron core when the magnetic field…
What is the unit of reluctance?
What is used as the dielectric material in high voltage transformers?
The temperature coefficient of resistance of eureka is
Referred to as the specific reluctance of a material
What solid has no defined crystal structure except perhaps in the arrangement of the nearest neighboring…
Which of the following materials has permeability slightly less than that of free space?
When a conductor is stationary and the magnetic field is moving or changing the emf induced is called
The force which set ups or tends to set up magnetic flux in a magnetic circuit
Which of the following has the least number of valence electrons?
A magnetic field is
Lenz' law states that the direction of the induced emf and hence current
If the magnetic material is located within a coil through which alternating current (60 Hz frequency)…
Defined as a closed path in which magnetic induction or flux flows
The unit of electrical energy is
Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying…
The diameter of a hydrogen atom is approximately ______ cm.
The permittivity of a material is given by one of the following formulas.
Defined as the ratio of the volume occupied by the atoms or ions in a unit cell divided by the volume…
The temperature coefficient of resistance of insulators is
The ratio between the intensity of magnetization produced in a substance to the magnetizing force producing…
The force of attraction or repulsion between two magnetic poles is inversely proportional to the square…
Permeance of a magnetic circuit is _________ the cross-sectional area of the circuit.
What is the diameter of an atom?
Back emf refers to the
The phenomenon that when an electric current passes through an anisotropic crystala there is an absorption…
Steel is hard to magnetize because of its
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