Electromagnetic Field Theory
The magnetic field at any point on the axis of current carrying circular coil will be

 at an angle 45o with the axis.
 zero.
 parallel to axis.
 perpendicular to axis.

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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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