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Consider a very strong uniform magnetic field directed in the plane of the paper "up". For...


Consider a very strong uniform magnetic field dire
Consider a very strong uniform magnetic field directed in the plane of the paper "up". For which of the following arrangements of bar magnets is the potential energy highest, and for which lowest? Highest energy state: Lowest energy state:
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Answer #1

The energy associated to the magnetic filed intecation with dipole is

U=-\vec{m}\cdot \vec{B}

where m is the dipole moment and dot product is the vector scalar product.

Dipoles have a magnic moment ortogonal the filed they generate, thus energy is highest for B (m,B antiparallel) and lowest for A while is null for C,D

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