Three Long Parallel Wires Each Carry 2 $4.0 \mathrm {~cm}$ What Is the Magnitude of the Magnetic Field at Same

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 $4.0 \mathrm {~cm}$ . What is the magnitude of the magnetic field at the fourth (unoccupied) corner of the square due to these wires? $\left( \mu _ { 0 } = 4 \pi \times 10 ^ { - 7 } \mathrm {~T} \cdot \mathrm { m } / \mathrm { A } \right)$

A) $12 \mu \mathrm { T }$
B) $21 \mu \mathrm { T }$
C) $2.1 \mu T$
D) $1.2 \mu \mathrm { T }$
E) $0 \mathrm {~T}$

Correct Answer:

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