+d- -d -d- -- -- +9 -9 -9 +9 -p +p

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-d-
P
+q
b- b-
+q
-
Electric quadrupole. The figure shows an electric quadrupole. It
consists of two dipoles with dipole moments that are equal in
magnitude but opposite in direction. What is the value of E on the
axis of the quadrupole for a point P a distance z from its center
(assume z >> d)? Take Q = 2qd? (which is known as the quadrupole
moment of the charge distribution.)
NOTE: Express your answer in terms of Q and z, using eo when needed.
E =
Transcribed Image Text:-d- P +q b- b- +q - Electric quadrupole. The figure shows an electric quadrupole. It consists of two dipoles with dipole moments that are equal in magnitude but opposite in direction. What is the value of E on the axis of the quadrupole for a point P a distance z from its center (assume z >> d)? Take Q = 2qd? (which is known as the quadrupole moment of the charge distribution.) NOTE: Express your answer in terms of Q and z, using eo when needed. E =
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