Two Long Parallel Wires That Are $0.40 \mathrm {~m}$ Apart Carry Currents Of

question 105

Multiple Choice

Two long parallel wires that are $0.40 \mathrm {~m}$ apart carry currents of $10 \mathrm {~A}$ in opposite directions. What is the magnetic field strength in the plane of the wires at a point that is $20 \mathrm {~cm}$ from one wire and 60 $\mathrm { cm }$ from the other? $\left( \mu _ { 0 } = 4 \pi \times 10 ^ { - 7 } \mathrm {~T} \cdot \mathrm { m } / \mathrm { A } \right)$

• A) \(6.7 \mu \mathrm { T }\)
• B) \(3.3 \mu \mathrm { T }\)
• C) \(33 \mu T\)
• D) \(67 \mu \mathrm { T }\)

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