Electromagnetic Field Theory
A magnetic circuit requires 800 AT to produce a certain quantity of flux in a magnetic circuit. If its excitation coil has 100 turns and 5 Ohm resistance, the voltage to be applied in exciting coil is

 40 V.
 60 V.
 8 V.
 80 V.

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Electromagnetic Field Theory
The wave in wave guide has

Larger wavelength than in the free space
Larger frequency than in the free space
Group velocity inversely proportional to wavelength
Diminishing wavelength than in the free space

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