Posted by Jeff on Sunday, March 10, 2013 at 10:06am.
Huh? cross product is zero
Huh! Cross product is zero.
look at
http://hyperphysics.phy-astr.gsu.edu/%E2%80%8Chbase/magnetic/forwir2.html
Note here sin theta = 0 so no force
In your other problems theta is not zero.
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