The figure shows a diagram of an electromagnetic pump for pumping molten metal. A section of a square pipe with side a = 1 cm, filled with metal, is placed in a magnetic field B = 0.1 T, perpendicular to the pipe axis; through the same section, perpendicular to both the field and the axis of the pipe, a current I = 100 A is passed. Find the excess pressure difference created by the pump.
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