Lecture19

# Lecture19 - Lecture 19 Chapter 21 Magnetic Force Exam 2...

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1 Lecture 19 Chapter 21. Magnetic Force Announcement: See next slide about Exam 2. 3/22/11 2 Exam 2 Wednesday March 30th, 2011 from 8 PM - 10 PM in PHYS 114 *Covers all readings, lectures, homework from Chapters 17 through 19 *The exam will be multiple choice and is meant to be done within 75 minutes by a well-prepared student. We will give 120 minutes starting promptly at the listed time, so please be on time! Be sure to bring your student ID card , calculator, and pencil. 3/22/11 3 Lorentz F = q E + q v × B F B = q v × B F = q vB sin φ 3/22/11 4 Right Hand Rule 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.

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2 3/22/11 5 Magnetic Force on a Current-Carrying Wire Force between Two Parallel Current Carrying Wires *Parallel currents attract *Anti-parallel currents repel F  = I L  × B 
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