Fig. 28-6 shows two long, parallel current-carrying wires. The wires carry equal currents I1 = I2 = 20 A in the directions indicated and are located a distance d = 0.5 m apart. Calculate the magnitude and direction of the magnetic field at a point located at an equal distance d from each wire.
a. 4?T upward
b. 8?T upward
c. 4?T to the right
d. 8?T downward
e. 4?T downward
Answer: b. 8?T upward
B = 2?i/2?d cos60 = 2*2e-7*20/0.5 * 0.5 = 8 ?T upward
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