Magnetic Field of a Long Wire: 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 cm. What is the magnitude of the magnetic field at the fourth (unoccupied) corner of the square due to these wires? (?0 = 4? × 10-7 T ? m/A)
A. 1.2 µT
B. 2.1 µT
C. 12 µT
D. 21 µT
E. 0 T
Answer: D
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