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Figure 1 below depicts an electric dipole. The positive and negative charges in the dipole are arrayed along the $y$ axis symmetrically about the origin. Two field points are shown. One field point, $P_\uparrow$, lies along the dipole axis a distance $z$ above the dipole center. The other field point, $P_\downarrow$, lies along the dipole axis a distance $z$ below the dipole center.

Which of the following statements correctly describes the relations between the magnitude and direction of the electric fields due to the dipole at points $P_\uparrow$ and $P_\downarrow$?

A

The fields have the same magnitude and the same sign.

B

The fields have the same magnitude and opposite signs.

C

The fields have different magnitudes and the same sign.

D

The fields have different magnitudes and the opposite signs.

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