Two parallel wires are (1 , textcm) away from each other. They both carry a (40 , textA) current. The force the two wires exert onto each other is attractive. How large is the magnitude of the net magnetic field halfway between the wires?
a) (0 , textT)
b) (2 × 10⁻⁷ , textT)
c) (4 × 10⁻⁷ , textT)
d) (8 × 10⁻⁷ , textT)