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September 2nd, 2017, 02:27 PM   #11
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 Originally Posted by MATHEMATICIAN So, the curve is an ellipse? And what about this orientation thing? What is its significance?
Are you working from a textbook at all?

The book should explain what is meant by the orientation of a curve.

It tells you which direction you traverse the curve in.

If the line integral of a curve through a field has value $I$, then the line integral of the same curve with opposite orientation through the field will have value $-I$

 September 2nd, 2017, 02:40 PM #12 Math Team     Joined: Jul 2013 From: काठमाडौं, नेपाल Posts: 831 Thanks: 60 Math Focus: सामान्य गणित I don't understand the book
 September 2nd, 2017, 03:12 PM #13 Senior Member     Joined: Sep 2015 From: Southern California, USA Posts: 1,410 Thanks: 715 you're moving along the curve... if you are tending towards the left overall from your point of view.. you are moving counter clockwise, if you are tending right you are moving clockwise. You know the old analog clocks? How their hands move? I know everything is digital these days but I still think people know clockwise vs. counterclockwise. If you are moving along the curve in a given orientation, and you stop and turn around, and continue moving, you are now moving in the opposite orientation. You can read about the orientation of curves and the associated right hand rule in a thousand places on the web.
September 2nd, 2017, 09:21 PM   #14
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Quote:
 Originally Posted by romsek You know the old analog clocks? How their hands move? I know everything is digital these days but I still think people know clockwise vs. counterclockwise.
I know analog clocks

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