Figure represents four positions of a current carrying coil is a magnetic field directed towards right. $\hat n$ represent the direction of area of vector of the coil. The correct order of potential energy is
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$P\varepsilon \, = \, - \,\vec M.\vec B$
So where $M$ is aloy area vector so $P\varepsilon $ is max. in position $I$ and minimum in $IV.$
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