A long, straight wire lies on a horizontal table and
Chapter 19, Problem 19.42(choose chapter or problem)
A long, straight wire lies on a horizontal table and carries a current of 1.20 A. In a vacuum, a proton moves parallel to the wire (opposite the direction of the current) with a constant velocity of 2.30 104 m/s at a constant distance d above the wire. Determine the value of d. (You may ignore the magnetic eld due to Earth.)
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