推 pilipilifans:和上一篇標題真像XD 12/09 20:01
推 ChungChin:試著用映像法 12/09 21:36
A magnetic dipole is placed above a superconductor Will the dipole ever float
in the air? If so what is its equilibrium position?
完全沒什麼頭緒 不知道要用什麼方法解
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