Three Very Long, Straight, Parallel Wires Each Carry Currents of 4.0

question 99

Multiple Choice

Three very long, straight, parallel wires each carry currents of 4.0 A, directed out of the page as shown in the figure. These wires pass through the vertices of a right isosceles triangle as shown. Assume that all the quantities shown in the figure are accurate to two significant figures. What is the magnitude of the magnetic field at point P at the midpoint of the hypotenuse of the triangle? (μ₀ = 4π × 10^-7 T ∙ m/A)

• A)4.4 µT
• B)18 µT
• C)57 µT
• D)130 µT
• E)1.8 µT

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