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Electromagnetic Field Theory
The core of coil length is 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be
48 mH.
24 mH.
3 mH.
12 mH.
48 mH.
24 mH.
3 mH.
12 mH.
Answer
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Related Question
Electromagnetic Field Theory
In an inductor current cannot change abruptly. Comment on the statement.
Cannot comment.
False.
True.
True partially.
Cannot comment.
False.
True.
True partially.
Answer
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Electromagnetic Field Theory
A vector field A = p In is given in Cartesian coordinates. In cylindrical coordinates it will be represented as
A = cosφ Ir + sinφ Iφ.
A = sinφ Ir.
A = cosφ Ir.
A = cosφ Ir - sinφ Ir.
A = cosφ Ir + sinφ Iφ.
A = sinφ Ir.
A = cosφ Ir.
A = cosφ Ir - sinφ Ir.
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
4.32.
2.16.
Zero.
Infinity.
4.32.
2.16.
Zero.
Infinity.
Answer
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Electromagnetic Field Theory
Magnetostriction is a phenomenon of
generation of electricity in ferromagnetic materials.
change in physical dimensions of ferromagnetic materials during magnetism.
generation of magnetism in electrical conductors.
change in permeability of ferromagnetic materials during magnetism.
generation of electricity in ferromagnetic materials.
change in physical dimensions of ferromagnetic materials during magnetism.
generation of magnetism in electrical conductors.
change in permeability of ferromagnetic materials during magnetism.
Answer
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Electromagnetic Field Theory
Which of the following statement regarding waveguides is incorrect?
At frequencies below the cut off value the wave progresses across the waveguide after total reflections
At waveguide can be coupled to a coaxial cable
Waveguides can handle large power at UHF and microwaves
Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves
At frequencies below the cut off value the wave progresses across the waveguide after total reflections
At waveguide can be coupled to a coaxial cable
Waveguides can handle large power at UHF and microwaves
Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves
Answer
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