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# 6.27 A Hertzian dipole is a short conducting wire carryingan approximately constant current over its length l. If such adipole is placed along the z axis with its midpoint at the origin,and if the current flowing through it is i(t) = I0 cos ωt, find thefollowing:(a) The retarded vector potential A!(R, θ, φ) at an observationpoint Q(R, θ, φ) in a spherical coordinate system.(b) The magnetic field phasor H!(R, θ, φ).Assume l to be sufficiently small so that the observation pointis approximately equidistant to all points on the dipole; that is,assume R$ ≈ R

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