A long straight wire on the
z-axis carries a current of 8.0 A in the +z direction (out of the
paper). A circular loop of radius 10 cm lies in the xy-plane and
carries a 3.0-A current, as shown in the figure. Point P, at the
center of the loop, is 25 cm from the z-axis. A proton is projected
from P with a velocity of 2.0 × 106m/s in the -x direction. The
magnitude of the net magnetic force on the proton is
__________x10-18N? (e = 1.60 × 10-19C, μ0 = 4π × 10-7 T ∙ m/A) See
figure 2.
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