1. Feb 17, 2007 #1

   O.J.

   

   a ring whose upper half is continuously + and lower half is continuously - at a point P a distance d from the centre. Now our instructer solved it for us pointing that the direction of the field is downwards. but im not convinced, because although the sine is contant, each time to move dTHETA u have a component in the z direction, while the magnitude we found was assigned a y direction only...:(:(

    

   O.J., Feb 17, 2007
2. 
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3. Feb 17, 2007 #2

   O.J.

   

   any ideas?

    

   O.J., Feb 17, 2007

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