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Amongst which of the following is best true about the effective area in terms of antenna theory?

5. Amongst which of the following is best true about the effective area in terms of antenna theory?

1. The effective area measures its capacity to capture or radiate electromagnetic energy
2. The effective area of an item or surface is frequently connected to its physical size, shape, and qualities
3. The effective area of an antenna measures the area which has the least electromagnetic energy
4. None of the above

Answer: A) The effective area measures its capacity to capture or radiate electromagnetic energy.

Explanation:

The effective area of an antenna is a key quantity that measures its capacity to capture or radiate electromagnetic energy. When calculating the power received or transmitted by an antenna, the effective area is a crucial element to consider. It is usually measured in square meters (m2).