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    • https://phys.libretexts.org/Courses/Kettering_University/Electricity_and_Magnetism_with_Applications_to_Amateur_Radio_and_Wireless_Technology/22%3A_Generation_and_Detection_of_Electromagnetic_Waves/22.03%3A_Radiation_from_a_Current_Moment
      Now we are ready to address the question “What is Δ˜E(r) due to Δ˜J(r)?” Without doing any math, we know quite a bit about \(\Delta\widetild...Now we are ready to address the question “What is Δ˜E(r) due to Δ˜J(r)?” Without doing any math, we know quite a bit about Δ˜E(r). If we are sufficiently far from the origin, and the loss due to the medium is negligible, then we expect the phase of Δ˜E(r) to change approximately at rate β where β is the phase propagation constant 2π/λ.

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