Two Long Parallel Wires Are $0.400 \mathrm {~m}$ Apart and Carry Currents Of

Multiple Choice

Two long parallel wires are $0.400 \mathrm {~m}$ apart and carry currents of $4.00 \mathrm {~A}$ and $6.00 \mathrm {~A}$ . What is the magnitude of the force per unit length that each wire exerts on the other wire? $\left( \mu _ { 0 } = 4 \pi \times 10 ^ { - 7 } \mathrm {~T} \right.$ . $\mathrm { m } / \mathrm { A }$ )

A) $12.0 \mu \mathrm { N } / \mathrm { m }$
B) $16.0 \mu \mathrm { N } / \mathrm { m }$
C) $2.00 \mu \mathrm { N } / \mathrm { m }$
D) $38.0 \mu \mathrm { N } / \mathrm { m }$
E) $5.00 \mu \mathrm { N } / \mathrm { m }$