Two Long Parallel Wires Carry Currents Of $20 \mathrm {~A}$ And $5.0 \mathrm {~A}$

question 29

Multiple Choice

Two long parallel wires carry currents of $20 \mathrm {~A}$ and $5.0 \mathrm {~A}$ in opposite directions. The wires are separated by $0.20 \mathrm {~m}$ . What is the strength of the magnetic field midway between the two wires? ( $\left. \mu _ { 0 } = 4 \pi \times 10 ^ { - 7 } \mathrm {~T} \cdot \mathrm { m } / \mathrm { A } \right)$

• A) \(3.0 \times 10 ^ { - 5 } \mathrm {~T}\)
• B) \(4.0 \times 10 ^ { - 5 } \mathrm {~T}\)
• C) \(2.0 \times 10 ^{- 5} \mathrm {~T}\)
• D) \(1.0 \times 10 ^{- 5} \mathrm {~T}\)
• E) \(5.0 \times 10 ^ { - 5 } \mathrm {~T}\)

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