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P5. Two coaxial rings, each of radius R, made of
thin wire are separated by a small distance d (d « R)
and carry the charges q and -q. Find the electric field
strength at the axis of the system as a function of the
x coordinate. Show that this result is equivalent of an
electric field of an electric dipole, which is oriented
along the x axis.
AX
d
-ą
R.

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