Two long, straight parallel wires carry currents in the positive y direction. wire 1 is at x=0 and carries a 20a current. wire 2 is at x=20cm and caries a 8a current. at what value of x in the plane of the wires is the magnetic field zero, in cm?

at x = 14.3 cm net magnetic field would be ZERO

Explanation:

At the position where net magnetic field would be zero

we will say that

here we know that

and due to another wire we have

so here we have

wavelegth as in spectrum red oygbiv

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it