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There are two parallel, long, straight conductors. A current of 
flows through the first conductor and 
through the second. Calculate:
where in between both conductors the magnetic field density equals zero if the conductors are spaced 
apart.
the magnetic field density at a point 
away from the first conductor and 
away from the second.
The currents in both conductors flow in the same direction and the permeability of free space is 
.
from the left conductor.
.
