原帖由 qwer 於 2016-2-4 09:38 AM 發表
If the current flows from R to S, and the force needed is upward, by left hand rule, RHS of the solenoid(view from top) is No ...
原帖由 antonyluk 於 2016-2-5 12:07 AM 發表
As you said, it should look like this.
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