The magnetic field due to a long straight current carrying wire is given by
B= or,
B∝ At the point exactly mid-way between the conductors, the net magnetic field is zero. Using right hand thumb rule, we find that the magnetic field due to left wire will be in
direction while due to the right wire is in
(−) direction.
Magnetic field at a distance x from the left wire, lying between the wires.
B=+(−) or,
B=(−) At
x=d,B=0 For
x<d,B is along
For
x>d,B is along
(−) On the left side of the left conductor, magnetic fields due to the currents will add up and the net magnetic field will be along
(−) direction.
To the right side of second conductor, the total magnetic field will be along
direction.