Chapter 29183P29.71(a)The magnetic force acting on ions in the blood stream willdeflect positive charges toward point Aand negativecharges toward point B.This separation of chargesproduces an electric field directed from Atoward B. Atequilibrium, the electric force caused by this field mustbalance the magnetic force, soqvBqEqVd==FHGIKJ∆orvVBd==××=−−∆160100 040 03 00101 3363VTmm sejbgej....FIG. P29.71(b)No. Negative ions moving in the direction of vwould be deflected toward point B, givingAa higher potential thanB.Positive ions moving in the direction of vwould be deflectedtoward A, again giving Aa higher potential than B. Therefore, the sign of the potentialdifference does not depend on whether the ions in the blood are positively or negativelycharged.P29.72When in the field, the particles follow a circular pathaccording to qvBmvr=2, so the radius of the path is: rmvqB=(a)When rhmvqB==, that is, when vqBhm=, theparticle will cross the band of field. It will move ina full semicircle of radius
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