Angle for maximum or minimum potential energy of a dipole

1. A.
   $\pi$ with direction of field.
2. B.
   $\frac{\pi}{2}$ with direction of field.
3. C.
   $\frac{3\pi}{2}$ with direction of field.
4. D.
   zero with direction of field.

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1. A.
   $\cos^{-1}(1)$
2. B.
   $\cos^{-1}(-1)$
3. C.
   $\sin^{-1}(1)$
4. D.
   $\sin^{-1}(-1)$

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