The direction of the magnetic force on the particle

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Unformatted text preview: icle’s velocity is zero. 60 50 40 30 20 There can be no magnetic force. 10 0 18 P re flig h t 4 T h re e p o ints a re a rra ng e d in a unifo rm m a g ne tic fie ld . T h e B fie ld p o ints into th e s c re e n. A B C D E 1) A positively charged particle is located at point A and is stationary. The direction of the magnetic force on the particle is: r rr F = qv × B BB 60 50 qv 40 30 F X B 20 10 0 21 r rr F = qv × B Cross Product Practice • protons (positive charge) coming out of screen • Magnetic field pointing down • What is direction of force on POSITIVE charge? BB A) Left B) Right ­ x + x C) UP + y D) Down E) Zero ­ y y x B 24 n ee scr z Motion of Charge q in Uniform B Field • Force is perpendicular to v – Speed does not change – Uniform Circular Motion x • Solve for R: r rr F = qv × B ⇒ F = qvB v a= R v qvB = m R x x Rx x x x q x 2 2 vx x xv x mv R= qB x x x x xF x x F F xF x x x x q x x q x x x v x x x x x x v xxxxxx Uniform B into page Demo 30 q x R= LHC mv p = qB qB 1 7 m ile s d ia m e te r Prefli...
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This document was uploaded on 02/13/2014.

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