A Long Straight Wire on the Z-Axis Carries a Current

question 144

Multiple Choice

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, μ₀ = 4π × 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

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