The L-shaped wire in the previous exercise (for Example 30.1) is now smoothed out with a quarter arc. In other words, the wire runs from y = +∞ to the point (0,b), then joined by a circular arc with radius b (centered at the point P(b,b)), continue on from (b,0) to x = +∞, with b = 0.4m. What is the magnetic field B (magnitude) at the point P(b,b) if the current is 2.0A?
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Here is the L-shaped wire (attached)

vector S is an inversion of theta, but collinear.

orthogonal to b

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