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25_Chapter 19 HomeworkCH19 Magnetism

# 25_Chapter 19 HomeworkCH19 Magnetism - Magnetism 19.57...

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Magnetism 165 19.57 (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 A toward B . At equilibrium, the electric force caused by this field must balance the magnetic force, so ( ) qvB qE q V d = = or ( ) ( ) 6 3 160 10 V 1.33 m s 0.040 0 T 3.00 10 m V v Bd × = = = × (b) The magnetic field is directed from N to S. If the charge carriers are negative moving in the direction of v G , the magnetic force is directed toward point B. Negative charges build up at point B , making the potential at A higher than that at B . If the charge carriers are positive moving in the direction of
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