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Electromagnetic Field Theory
When the phase velocity of an EM wave depends on frequency in any medium the phenomenon is called
Polarisation
Dispersion
Absorption
Scattering
Polarisation
Dispersion
Absorption
Scattering
Answer
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Related Question
Electromagnetic Field Theory
The force required to seperate two surfaces with a contact area measuring 5 cm by 6 cm, when flux density normal to the surface is 0.8 tesla, will be
76400 N.
7640 N.
76.4 N.
764 N.
76400 N.
7640 N.
76.4 N.
764 N.
Answer
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Electromagnetic Field Theory
An electric field on a place described by its potential V = 20 (r -1 + r-2) where r is the distance from the source. The field is due to
A dipole.
A quardra pole.
A monopole.
Both of A and B.
A dipole.
A quardra pole.
A monopole.
Both of A and B.
Answer
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Electromagnetic Field Theory
Magnetostriction is a phenomenon of
change in permeability of ferromagnetic materials during magnetism.
change in physical dimensions of ferromagnetic materials during magnetism.
generation of magnetism in electrical conductors.
generation of electricity in ferromagnetic materials.
change in permeability of ferromagnetic materials during magnetism.
change in physical dimensions of ferromagnetic materials during magnetism.
generation of magnetism in electrical conductors.
generation of electricity in ferromagnetic materials.
Answer
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Electromagnetic Field Theory
Two identical circular coils, one closed and another is little split (not enclosed) are placed in an uniform magnetic field which decrease at a constant rate. If the plane to the coils are perpendicular to the field which of the following statements is true?
An emf is induced in both coils.
Equal joule heating occurs in both coils.
Joule heating does not occur in each of the coils.
An emf is induced in split coil.
An emf is induced in both coils.
Equal joule heating occurs in both coils.
Joule heating does not occur in each of the coils.
An emf is induced in split coil.
Answer
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Electromagnetic Field Theory
In an iron core coil the iron core is removed so that the coil becomes an air core coil. The inductance of the coil will
remain the same.
increase.
initially increase and then decrease.
decrease.
remain the same.
increase.
initially increase and then decrease.
decrease.
Answer
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