To practice Problem-Solving Strategy 32.1 The magnetic field of a current.
A long wire carries current 
. The wire is straight except for one square-shaped "half-loop" KLMN as shown. (Figure 1) Find the magnitude and the direction of the magnetic field 
at point P. Assume that 
is a known quantity.
Find the magnitude of magnetic field 
.
Express your answer in terms of some or all of the quantities and , and the constants 
and 
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