Magnetic Field of a Current Loop: 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. An electron is projected from P with a velocity of 3.0 × 106 m/s in the -x direction. What is the y component of the magnetic force on the electron? (e = 1.60 × 10-19, ?0 = 4? × 10-7 T ? m/A)
A. -9.0 × 10-18 N
B. 9.0 × 10-18 N
C. -4.5 × 10-18 N
D. 4.5 × 10-18 N
E. zero
Answer: A
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