For the polarization of electromagnetic waves, which of the following description is correct? (Multiple choice)

Question

Options

• AThe antenna radiates electromagnetic waves to the surrounding space, and the direction of its
• BThe polarization of the antenna refers to the direction of the magnetic field strength formed when
• CIf the electric field direction of the electric wave is perpendicular to the ground, we call it a vertically
• DIf the transmitting antenna is circularly polarized, the receiving antenna must also be circularly

• A
  72% (28)
• B
  28% (11)

Explanation

Options A, C, and D are correct because they accurately describe key principles of electromagnetic wave polarization: the direction of radiation from an antenna follows specific polarization patterns, vertical polarization is correctly defined as when the electric field vector is perpendicular to the ground, and circular polarization requires matching polarization on both the transmitting and receiving antennas for efficient signal reception.

Option B is wrong because it incorrectly attributes polarization to the direction of the magnetic field - polarization is always defined by the orientation of the electric field vector (E-field), not the magnetic field (H-field). This is the classic trap in polarization questions.

Memory tip: Think "E defines Electric Electro-polarization" - the E-field owns polarization, always. Also remember the rule: like polarization receives like - a circularly polarized transmitter needs a circularly polarized receiver, just as a vertical antenna works best with another vertical antenna.

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