To radiate EM signal of wavelength λ with high efficiency, the antennas should have a minimum size equal to :
(1) λ/2
(2) λ/4
(3) 2λ
(4) λ JEE-2024
Solution:
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The magnetic field at the centre of a wire loop formed by two semi circular wires of radii R1 = 2 πm and R2 = 4π m carrying current I = 4A as per figure given below is a × 10^–7 T. The value of a is ______. (Centre O is common for all segments)
