Electromagnetic Field Theory
The transmitting antennas for lower frequencies (below 500 kHz) are generally

Vertical grounded wire type
Any of the above
Parabolic reflector type
Horizontal suspended wire type

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Electromagnetic Field Theory
Inside a hollow conducting sphere

 electric field changes with magnitude of the charge given to the conductor.
 electric field is a non zero constant.
 electric field changes with distance from the center of the sphere.
 electric field is zero.

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