Field of a Circular Loop: a Long Straight Very Thin

question 20

Multiple Choice

Field of a circular loop: A long straight very thin wire on the y-axis carries a 10-A current in the positive y-direction. A circular loop 0.50 m in radius, also of very thin wire and lying in the yz-plane, carries a 9.0-A current, as shown. Point P is on the positive x-axis, at a distance of 0.50 m from the center of the loop. What is the magnetic field vector at point P due to these two currents? (μ₀ = 4π × 10^-7 T ∙ m/A)

• A) zero
• B) -8.0 × 10^-6 T
• C) (+4.0 × 10^-6
• T) - (4.0 × 10^-6
• D) (-4.0 × 10^-6
• T) - (4.0 × 10^-6
• E) (-4.0 × 10^-6
• T) - (80 × 10^-6

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