The external magnetic field exerts a force on each wire that equals I x B per meter. The direction would be west.
Parallel wires also exert a force on each other. It is an attractive force when the currents are in the same direction. You can find the formula at
http://theory.uwinnipeg.ca/physics/mag/node10.html
Add it vectorially to the force caused by the external B field.
two llong parallel vertical wires 0.3m apart are placed east-west of one another.The current in the eastely one is 30A and that in the other is 20A.Both currents flow upwards.The earth"smagnetic field is horizontal directed north and has magnetude field B=20x10^-6T.Calculate the resultant force per meter on each wire
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