4 sides of the wire can produce a B-field

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    B-field Wire
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The discussion focuses on the magnetic field (B-field) generated by a wire and its interaction with forces. Participants question why the force is not directed downward despite the wire gaining weight and why the B-field direction is not outward from the page. The right-hand grip rule is referenced to explain the B-field produced by the wire's four sides. Calculations involving the formula i L x B are emphasized to determine the forces on different segments of the wire. The conversation concludes with a reminder to prioritize using the formula over worrying about the B-field direction.
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clovergogo said:
http://upload.lsforum.net/users/public/m28175Untitledw43.jpg

Q 21 why the is not downward?? it gains weight!
The wire runs into/out of page. Calculate i L x B.
Q22 why the direction is not out of paper, by right hand grip rule, 4 sides of the wire can produce a B-field which is out of paper!?

i L x B again. This time, solve for B.

What forces are exerted on AB and CD? On BC?

Don't be concerned with the direction of the B fields generated by the wire. Use the formula!
 

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