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A thin ring with radius R is placed on the xy plane. The line charge density on the ring is fixed
and distributes as A sin o (where o = 0 is defined at the +x direction).
a) Calculate the electric dipole moment of the ring.
b) Write down the electric potential at a point (x, y, z) that is much farther from the origin
than R. Express your result as a function of 2, R, x, y, z. (Do NOT use p or 7 in your result.)

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