Two parallel infinite wires are carrying current of 10 A in opposite directions. The distance between the wires is 5 cm. Find the magnetic field at the midpoint between them.
A) 8.0 x 10⁻⁶ T
B) 1.0 x 10⁻⁶ T
C) 2.0 x 10⁻⁶ T
D) 4.0 x 10⁻⁶ T