![Two identical copper wires W1 and W2, placed in parallel as shown in the figure, carry currents I and 2I, respectively, in opposite directions](https://www.gkseries.com/blog/wp-content/uploads/2023/08/Two-identical-copper-wires-W1-and-W2-placed-in-parallel-as-shown-in-the-figure-carry-currents-I-and-2I-respectively-in-opposite-directions.jpg)
Q. Two identical copper wires W1 and W2, placed in parallel as shown in the figure, carry currents I and 2I, respectively, in opposite directions. If the two wires are separated by a distance of 4r, then the magnitude of the magnetic field ⃗B→ between the wires at a distance r from W1 is
![](https://www.gkseries.com/blog/wp-content/uploads/2023/08/image-17.png)
Solution:
![](https://www.gkseries.com/blog/wp-content/uploads/2023/08/Screenshot-532.png)