Magnetism16519.57(a) Since the magnetic field is directed from N to S (that is, from left to right within the artery), positive ions with velocity in the direction of the blood flow experience a magnetic deflection toward electrode A. Negative ions will experience a force deflecting them toward electrode B. This separation of charges creates an electric field directed from Atoward B. At equilibrium, the electric force caused by this field must balance the magnetic force, so ( )qvBqEqV d==∆or ()6316010V1.33 m s0.040 0 T3.0010mVvBd−−∆×===×(b) The magnetic field is directed from N to S. If the charge carriers are negative moving in the direction of vG, the magnetic force is directed toward point B. Negative charges build up at point B, making the potential at Ahigher than that at B. If the charge carriers are positive moving in the direction of
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