Electromagnetic Field Theory
A plane wave magnetic field is represented by Bx = cos(y – ct). The electric and magnetic fields will be zero in the direction

 Ex = Ey = 0, By = Bz = 0.
 None of these.
 Ex = Ey = 0, Bx = By = 0.
 Ey = Ez = 0, By = Bz = 0.

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Electromagnetic Field Theory
The wave in wave guide has

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

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Electromagnetic Field Theory
A long wire composed of a smooth round conductor runs above and parallel to the ground (assumed to be a large conducting plane). A high voltage exists between the conductor and the ground. The maximum electric stress occurs at

 upper surface of the conductor.
 lower surface of the conductor.
 the ground surface.
 midway between the conductor and ground.

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