A 2.00 meter long, straight rod is 1.00 mm in diameter an is made of pure copper (specific gravity 8.93). A uniform magnetic field is applied perpendicular to the wire and adjusted in strength until the wire just floats in the air! The magnetic field strength is measured to be 200.0 µT. What is the potential difference between the ends on the wire? resistivity of copper= 1.70x10-8 ohm-m