Two parallel wires separated by a distance of 0.6 m each carry current in the same direction. One wire is carrying a current of 4 A and the other is carrying a current of 9 A. The magnitude of the magnetic field exactly in between the two wires is T.

The value is  

Explanation:

From the question we are told that

  The distance of separation is  

  The current on the one wire is

  The current on the second wire is

Generally the magnitude of the field exerted between the current carrying wire is

Here is the magnetic field due to the first wire which is mathematically represented as

Here is the distance to the half way point of the separation and the value is  

is the magnetic field due to the first wire which is mathematically represented as

Here is the distance to the half way point of the separation and the value is  

This means that

So

=>  

=>  

=>  

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.