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

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) $67 \mu \mathrm { T }$

Correct Answer:

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