(a) BJK = 0 T
A long wire carries current I. The wire is straight except for one square-shaped "half-loop" KLMN as shown (Figure 1). Assume that d is a known quantity.
(a) Find the magnitude of magnetic field Bnet at point P. Express your answer in terms of some or all of the quantities d and /, and the constants μ0 and π.
(b) Find the direction of the magnetic field at P.
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