Answer to Question #302726 in Electricity and Magnetism for Aarthhi

Question

Figure 2 below show cross section of two long straight wire separated by distance 0.5 m. Wire 2 carries current 2.0 A directed into the page. Determine the magnitude and direction (into or out of the page) of the current in wire 1 if the resultant of the magnetic field due to the two wire is zero at point Q located 0.8m from wire 2. Sketch diagram to prove your answer.

Answer 1

$I_2=I_1\frac{r_2}{r_1}=I_2\frac{d+l}d=5.2~A.$