A long, straight wire lies on a horizontal table in thexy - plane and carries a current of 1.20 µA in the positivex - direction along the x - axis. A proton is traveling in the negativex - direction at speed 2.30 x 104 m/s a distance d abovethe wire (i.e., z = d ). (a) What is the direction of the magneticfield of the wire at the position of the proton? (b) Whatis the direction of the magnetic force acting on the proton?(c) Explain why the direction of the proton’s motion doesn’tchange. (d) Using Newton’s second law, find a symbolicexpression for d in terms of the acceleration of gravity g, theproton mass m, its speed v, charge q, and the current I.(e) Find the numeric answer for the distance d using theresults of part (d).

College Physics
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ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
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A long, straight wire lies on a horizontal table in the
xy - plane and carries a current of 1.20 µA in the positive
x - direction along the x - axis. A proton is traveling in the negative
x - direction at speed 2.30 x 104 m/s a distance d above
the wire (i.e., z = d ). (a) What is the direction of the magnetic
field of the wire at the position of the proton? (b) What
is the direction of the magnetic force acting on the proton?
(c) Explain why the direction of the proton’s motion doesn’t
change. (d) Using Newton’s second law, find a symbolic
expression for d in terms of the acceleration of gravity g, the
proton mass m, its speed v, charge q, and the current I.
(e) Find the numeric answer for the distance d using the
results of part (d).

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