Same current i is flowing in three infinitely long wires

Last updated: 5/28/2023

Same current i is flowing in three infinitely long wires along positive x y and z directions The magnetic field at a point 0 0 a would be I think ans is 3 ans is But given 1 Hoi i 2 Hoi i i 2 3 Hoi i 1 2 uni please explain