Three Long Parallel Wires Each Carry 2 $\vec { B }$

question 10

Multiple Choice

Three long parallel wires each carry 2.0-A currents in the same direction.The wires are oriented vertically,and they pass through three of the corners of a horizontal square of side 4.0 cm.What is the magnitude of the $\vec { B }$ field at the fourth (unoccupied) corner of the square due to these wires? (μ₀ = 4π × 10^-7 T ∙ m/A)

• A)1.2 µT
• B)2.1 µT
• C)12 µT
• D)21 µT
• E)0 T

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