A straight 25.0-g wire that is 1.80 m long carries a current of
6/30 A. This wire is aligned horizontally along the west-east
direction with the current going from west to east. You want to
support the wire against gravity using the weakest possible uniform
external magnetic field.
(a) Which way should the magnetic field point?
(b) What is the magnitude of the weakest possible magnetic field you could use?
(please show all steps)
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