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# db_lec11_post - Exam 1 80 70 60 50 40 30 20 10 0 0 20 40 60...

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Exam 1 2/19/12 D. Bortoletto PHYS221 1 Average 67% 22 students (5%) with 100% 0 10 20 30 40 50 60 70 80 0 20 40 60 80 100 120

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Lecture 11 2/19/12 D. Bortoletto PHYS221 2 This Lecture More examples of Ampere’s Law Microscopic view of magnets The magnetic field of the Earth Last Lecture Motion of charged particles in the presence of electrical and magnetic fields (direction given by RHR) Ampere’s Law F = q E + q v × B F = qE + qvB sin θ B closed path Δ L = μ 0 I enclosed Field out a straight long wire 0 2 π μ I B r =
2/19/12 3 Right Hand Rule: Magnetic Force on a Moving Charge Direction of F B is perpendicular to plane containing v & B . If q is positive, F B has the same sign as v x B . If q is negative, F B has the opposite sign of v x B . F B is never parallel to v . F B can only change the direction of the particle not the speed. D. Bortoletto PHYS221

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2/19/12 4 Right Hand Rule: Magnetic Force on a Current-Carrying Wire Direction of F B is perpendicular to plane containing L & B . *L is in the direction of the current D. Bortoletto PHYS221 F B = I L × B F B = ILB sin θ * F B given by right hand rule * Magnitude
2/19/12 5 Right Hand Rule: Magnetic Field Lines of a Straight Wire *Put the thumb from your right hand in the direction of the current.

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