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Problem 27.1: Identify the poles of a square magnet

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灰色の四角が磁石,赤い矢印は方位磁針(北を指すコンパスの針)である.磁石はピンクの部分をマウスでつかみ移動できるし,方位磁針も移動できる.(長さの単位は cm.Restart. 磁石の磁極を調べなさい.色がついた部分を目印にして表現すればよい.

Problem authored by Anne J. Cox.
Script by Morten Brydensholt and modified by Anne J. Cox.

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