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121homework 8 - Felder Jacob Homework 9 Due Nov 7 2006 9:00...

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Felder, Jacob – Homework 9 – Due: Nov 7 2006, 9:00 pm – Inst: Vitaly 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Find the magnitude of the magnetic force on a proton moving with velocity 4 . 31 Mm / s in the positive x direction in a magnetic field of 1 . 65 T in the positive z direction. Correct answer: 1 . 13939 pN. Explanation: Let : q = 1 . 60218 × 10 - 19 C , ~v = (4 . 31 Mm / s) ˆ ı = (4 . 31 × 10 6 m / s) ˆ ı , and ~ B = (1 . 65 T) ˆ k . ~ F = q~v × ~ B = (1 . 60218 × 10 - 19 C) × £ (4 . 31 × 10 6 m / s) ˆ ı / × h (1 . 65 T) ˆ k i × 10 12 pN 1 N = - (1 . 13939 pN) ˆ  , so the magnitude is 1 . 13939 pN . keywords: 002 (part 1 of 1) 10 points A straight wire segment 2 m long makes an angle of 30 with a uniform magnetic field of 0 . 33 T. Find the magnitude of the force on the wire if it carries a current of 2 . 7 A. Correct answer: 0 . 891 N. Explanation: Let : = 2 m , θ = 30 , I = 2 . 7 A , and B = 0 . 33 T .
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