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Electromagnetic Field Theory

Electromagnetic Field Theory
Which of the following is zero in relation to electromagnetic fields?

 Curl curl A.
 Div curl A.
 Grad div A.
 Div grad V.

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Electromagnetic Field Theory
Fleming's right hand rule may be applied to an electric generator to find out the direction of

None of these
 rotor rotation.
 induced emf.
 magnetic field.

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Electromagnetic Field Theory
The drawback of Daltons atomic structure is that, it says

 most of the volume of an atom is empty space.
 none of these.
 the atoms can neither be created nor be destroyed.
 unique nature of atom.

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Electromagnetic Field Theory
Parabolic and lens antenna used at

High frequency
Low frequency
Microwave frequency
Medium frequency

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Electromagnetic Field Theory
The two windings of a transformer have an inductor of 2 H each. If mutual inductor between them is also 2 H, then

 it is a perfect transformer.
 turns ratio of the transformer is also two.
 transformer is an ideal transformer.
 none of these.

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Electromagnetic Field Theory
Voltage applied across a dielectric produces an electrostatic field 50 times greater than air. The dielectric constant of the dielectric will be

 10.
 5.
 20.
 50.

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