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Electric dipole radiation

For a localized source whose size is small compared with its radiation wavelength, the radiation fields of its electric dipole moment

p

are

E_{rad} = \frac{μ _{0}}{4 π R} R \times (R \times \overset{p}{¨} (t - R / c)), B_{rad} = \frac{1}{c} R \times E_{rad} .

Their total instantaneous power is

P = \frac{μ _{0}}{6 π c} ∣ \overset{p}{¨} (t - R / c) ∣^{2} .

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