Problem 4 An infinitely long wire carrying current I is bent at a right angle as shown in the figure. Find the magnetic field at point P which is at a distance z from the corner of the wire. (Hint: There are two segments. The magnetic field due to one of the segments is zero. For the other segment use the result for the half infinite wire in the lecture notes.)

Problem 4 An infinitely long wire carrying current I is bent at a right angle as shown in the figure. Find the magnetic field at point P which is at a distance z from the corner of the wire. (Hint: There are two segments. The magnetic field due to one of the segments is zero. For the other segment use the result for the half infinite wire in the lecture notes.)