Discussion
What is a small loop antenna equivalent to?
Answer: B
A loop much smaller than a wavelength carries essentially uniform current and radiates like a magnetic dipole, with its electric and magnetic fields interchanged relative to the short electric dipole. Its pattern is the same doughnut shape but with the null perpendicular to the plane of the loop rather than along a wire. This duality between the electric and magnetic cases is one of the tidiest results in antenna theory and makes the loop's fields obtainable without fresh integration.
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