A long, straight wire lies on a horizontal table inthe

Chapter , Problem 52

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A long, straight wire lies on a horizontal table inthe xy-plane and carries a current of 1.20 mA in thepositive x-direction along the x-axis. A proton is travelingin the negative x-direction at speed 2.30 3 104 m/sa distance d above the wire (i.e., z 5 d). (a) What is thedirection of the magnetic field of the wire at the positionof the proton? (b) What is the direction of themagnetic force acting on the proton? (c) Explain whythe direction of the protons motion doesnt change.(d) Using Newtons second law, find a symbolic expressionfor d in terms of the acceleration of gravity g, theproton mass m, its speed v, charge q, and the currentI. (e) Find the numeric answer for the distance d usingthe results of part (d).