Two long straight parallel wires are a distance d part. They carry steady equal currents flowing out of the plane of the paper. The variation of magnetic field B along the line x x^ is given by

Step-by-step solution

The magnetic field in between because of each will be in opposite direction. B_ in between = ₀ i 2 x j - ₀ i 2 (2 d-x) - j = ₀ i 2 [ 1 x - 1 2 d-x ] j At x=d, B_ in between =0 For x < d, B_ in between = j For x>d, B_ in between =- j Towards x , net magnetic field will add up and direction will be (- j ) . Towards x^ , net magnetic field will add up and direction will be ( j ) .