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Electromagnetic Field Theory

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

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

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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
Absorption
Scattering
Dispersion

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Electromagnetic Field Theory
The tubes of force within the magnetic material are known as

 magnetic flux.
 lines of force.
 tubes of indication.
 none of them.

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Electromagnetic Field Theory
Magnetic current is composed of which of the following?

None of these
 Only conduction current.
 Only displacement current.
 Both conduction and displacement current.

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Electromagnetic Field Theory
A Yagi antenna has a driven antenna

With a reflector
With one or more directors
With a reflector and one or more directors
Only

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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

 76.4 N.
 764 N.
 76400 N.
 7640 N.

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