Unformatted text preview: First Name Last Name ID Section Question 5 (30 points): For each of the three scenarios depicted below, determine if the proton (denoted 11+)
experiences a magnetic force. If so, in which direction does the magnetic force point? Be sure to thoroughly explain
your answers! a). s p.
N L. P At the location of the proton, the ﬁeld produced by the permanent magnet points upward, anti-parallel to the direc—
tion of the velocity (this is because the ﬁeld lines produced by permanent magnets form loops that go in the south and go out the north pole of the magnet). Since E is anti-parallel to 17, 0 2 180°, sin0 = 0, and the Lorentz force
W = q WI lg sin0 vanishes. Thus the proton experiences no magnetic force. b). Here the current carrying wire is inﬁnitely long and straight. At the location of the proton, the ﬁeld produced by the current carrying wire is into the page by the ﬁrst right
hand rule. Using the second right hand rule then gives us that the magnetic force on the proton is upward. c). Here the negatively charged bar moves to the right at constant speed, as indicated. Ubar Notice that a bar of negative charges traveling to the right is equivalent to an electric current traveling to the left at
the same location. Right hand rule #1 would then give that the magnetic ﬁeld is into the page at the location of the
proton, and applying right hand rule #2 gives us that the magnetic force on the proton points downward. ...
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