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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.
Joule heating does not occur in each of the coils.
Equal joule heating occurs in both coils.
An emf is induced in split coil.
An emf is induced in both coils.
Joule heating does not occur in each of the coils.
Equal joule heating occurs in both coils.
An emf is induced in split coil.
Answer
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Related Question
Electromagnetic Field Theory
Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?
None of these
Rain drops may not collect
Charge per unit area becomes very high for lightening to discharge
Dust particles may not accumulate
None of these
Rain drops may not collect
Charge per unit area becomes very high for lightening to discharge
Dust particles may not accumulate
Answer
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Electromagnetic Field Theory
In a dielectric material an applied field in x direction Ex = 5 v/m gives a polarization of px = 3/10π ux nc/m2. The susceptibility of the material is
Zero.
2.16.
Infinity.
4.32.
Zero.
2.16.
Infinity.
4.32.
Answer
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Electromagnetic Field Theory
Magnetostriction is a phenomenon of
generation of magnetism in electrical conductors.
change in physical dimensions of ferromagnetic materials during magnetism.
change in permeability of ferromagnetic materials during magnetism.
generation of electricity in ferromagnetic materials.
generation of magnetism in electrical conductors.
change in physical dimensions of ferromagnetic materials during magnetism.
change in permeability of ferromagnetic materials during magnetism.
generation of electricity in ferromagnetic materials.
Answer
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Electromagnetic Field Theory
Ohm’s law in point from field theory can be expressed as
J = E / σ.
J = σE.
R = ρ × ( l / A).
V = IR.
J = E / σ.
J = σE.
R = ρ × ( l / A).
V = IR.
Answer
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Electromagnetic Field Theory
The coils having self inductance of 10 mH and 15 mH have an effective inductance of 40 mH, when connected in series aiding. What will be the equivalent inductance if we connect then in series opposing?
5 mH.
0 mH.
10 mH.
20 mH.
5 mH.
0 mH.
10 mH.
20 mH.
Answer
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