5. Using Eq. 28-2 and Eq. 3-30, we obtain GFqvB vBqv B vBxyyxxx=−=−dibg±±kk3 where we use the fact that By= 3Bx. Since the force (at the instant considered) is Fz±k where Fz= 6.4 ×10–19N, then we are led to the condition ()3.3zxzxFqv vB FBqv v−=⇒
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