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Unformatted text preview: assume nonrelativistic motion.) [continued on back] 3) Consider an electric dipole consisting of a chargeq and a charge + q separated by a constant distance D . a) If the dipole is stationary, what is ~ E ( ~ r ), where ~ r is measured from the point midway between the charges? What is ~ E in the limit that r → ∞ ? b) Suppose that the dipole is rotating about the point midway between the charges, with angular frequency ω (see Fgure). What is ~ E ( ~ r, t )? What is ~ B ( ~ r, t )? What is the power emitted per unit angle, dP/d Ω, in a direction at angle θ to the axis of rotation? (Hint: Problem 3.2 of the textbook might be useful for this problem, too. You may assume nonrelativistic motion.)...
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 Fall '05
 RYDEN
 Astronomy, Frequency, Euclidean geometry, Fundamental physics concepts

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