# The intensity of radiation from an electric dipole is proportional to (sin 2 )/r 2 , where is the angle between the electric dipole moment and the position vector r . A radiating electric dipole lies along the z

The intensity of radiation from an electric dipole is proportional to (sin^{2} θ)/r^{2}, where θ is the angle between the electric dipole moment and the position vector **r**. A radiating electric dipole lies along the z axis (its dipole moment is in the z direction). Let I_{1} be the intensity of the radiation at a distance r = 10 m and at angle θ = 90^{o}. Find the intensity (in terms of I_{1}) at

(a) r = 30 m, θ = 90º;

(b) r = 10 m, θ = 45º; and

(c) r = 20 m, θ = 30º.

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