Two long straight parallel wires separated by a distance of 20 cm carry currents of 30 A and 40 A in opposite directions. What is the magnitude of the resulting magnetic field at a point that is 15 cm from the wire carrying the 30-A current and 25 cm from the other wire?
A. 51 ?T
B. 33 ?T
C. 72 ?T
D. 64 ?T
E. 46 ?T
Answer: B
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