What is the radiation intensity for isotropic antenna having radiation power density \(\frac{3 sin⁡θ}{r^2}a_r W/m^2\)?

What is the radiation intensity for isotropic antenna having radiation power density \(\frac{3 sin⁡θ}{r^2}a_r W/m^2\)?

(a) 3sinθ ar W/Steradian

(b) 3cosθar W/Steradian

(c) 6πsinθ ar W/Steradian

(d) 6πcosθ ar W/steradian

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The above asked question is from Isotropic Radiators in section Antenna Parameters of Antennas

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What is the radiation intensity for isotropic antenna having radiation power density \(\frac{3 sin⁡θ}{r^2}a_r W/m^2\)?

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