23. Electric Dipole Field

23. Electric Dipole Field - ∼ r-3 than from an electric...

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Electric Dipole Field -q +q 0 E - E + x p L E = kq ( x - L/ 2) 2 - kq ( x + L/ 2) 2 = kq » ( x + L/ 2) 2 - ( x - L/ 2) 2 ( x - L/ 2) 2 ( x + L/ 2) 2 = 2 kqLx ( x 2 - L 2 / 4) 2 2 kqL x 3 = 2 kp x 3 (for x À L ) Electric dipole moment: ~ p = q ~ L Note the more rapid decay of the electric field with distance from an electric dipole
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Unformatted text preview: ( ∼ r-3 ) than from an electric point charge ( ∼ r-2 ). • The dipolar field is not radial. tsl23 – p.1/1...
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