Two short electric dipoles are placed as shown ( \( r \) is the distance between their centers)....

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Two short electric dipoles are placed as shown ( \( r \) is the distance between their centers). The energy of electric interaction between these dipoles will be
(C is center of dipole of moment \( \mathrm{P}_{2} \) )
(a) \( \frac{2 k P_{1} P_{2} \cos \theta}{r^{3}} \)
(b) \( \frac{-2 k P_{1} P_{2} \cos \theta}{r^{3}} \)
(c) \( \frac{-2 k P_{1} P_{2} \sin \theta}{r^{3}} \)
(d) \( \frac{-4 k P_{1} P_{2} \cos \theta}{r^{3}} \)
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