A wire that is 46 cm long is parallel to a 0.54 T uniform magnetic field. The current through the wire is 4.5 A. What force acts on the wire?

3 answers

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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