A plane wire loop of irregular shape is situated so that part of it is in a

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A plane wire loop of irregular shape is situated so that part of it is in a uniform magnetic field B (in Fig. 5.57 the field occupies the shaded region, and points perpondicular to the plane of the loop). The loop carries a current I. Show that the net magnetic force on the loop is F = IBw, where w is the chord subtended. Generalize this result to the case where the magnetic field region itself has an irregular shape. What is the direction of the force?

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