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[Phy] 07AL Phy P1 Q3 about E&M

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07AL Phy P1 Q3 about E&M



If the current flows from S to R, and the force needed is upward, by left hand rule, RHS of the solenoid(view from top) is North pole.
And then by right hand grip rule, the direction of current flowing through the solenoids is clockwise(view from left).
Why the ans shows the direction of current is anti-clockwise?
Thanks.

[ 本帖最後由 qwer 於 2016-2-4 05:22 PM 編輯 ]
   

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引用:
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 ...
Actually, the current is from S to R as indicated in the diagram.

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sorry, typo, but the problem still exist, thanks

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回覆 3# qwer 的帖子

If you agree that the current is from S to R, then why RHS of the solenoid (view from top) is North? When you thumb points up, second finger points into the page, first finger should point to the left, do you agree?

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Yes. Then it shows that LHS of the solenoid is South and RHS is North.(Since the direction pointed by first finger is south).
Where do I get mistake?Thanks.

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As you said, it should look like this.
附件: 您所在的用戶組無法下載或查看附件

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引用:
原帖由 antonyluk 於 2016-2-5 12:07 AM 發表
As you said, it should look like this.
Get it now, I think the situation is below originally.

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引用:
原帖由 antonyluk 於 2016-2-5 12:07 AM 發表
As you said, it should look like this.
Get it. I think the original situation is below originally.

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thx for sharing

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