An electric dipole is constructed by fixing two circular charged rings, each of radius a with an...

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An electric dipole is constructed by fixing two circular charged rings, each of radius a with an insulating contact (see figure). One of these rings has total charge \( +Q \) and the other has total charge \( -Q \). If the charge is distributed uniformly along each ring, the dipole moment about the point of contact will be:
A) \( \frac{Q a}{\pi} \hat{2} \)
B) \( 4 \pi Q a \hat{z} \)
C) \( 2 Q a \hat{z} \)
D) Zero
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