Two Very Long Parallel Wires Carry Currents in the Positive

Multiple Choice

Two very long parallel wires carry currents in the positive x direction. One wire (current = 15 A) is coincident with the x axis. The other wire (current = 50 A) passes through the point (0, 4.0 mm, 0) . What is the magnitude of the magnetic field at the point (0, 0, 3.0 mm) ?

A) 3.8 mT
B) 2.7 mT
C) 2.9 mT
D) 3.0 mT
E) 0.6 mT