Lect12 - Physics 212 Physics 212 Lecture 12 Lecture 12...

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Unformatted text preview: Physics 212 Physics 212 Lecture 12 Lecture 12 Today's Concept: Today's Concept: Magnetic Force on moving charges Magnetic Force on moving charges = r r r F qv B 10 20 30 40 50 Avg = 3.0 Avg = 3.0 Confused Confused Confident Confident Music Who is the Artist? Who is the Artist? A) A) John Prine John Prine B) B) Little Feat Little Feat C) C) Taj Mahal Taj Mahal D) D) Ry Cooder Ry Cooder E) E) Los Lobos Los Lobos Why? Why? Last time did Buena Vista Social Club (Cuba) Last time did Buena Vista Social Club (Cuba) Ry Cooder was the guy who brought them to our attention in this country Ry Cooder was the guy who brought them to our attention in this country Also, this album is great. Also, this album is great. BB BB Physics 212 Physics 212 Lecture 12 Lecture 12 Today's Concept: Today's Concept: Magnetic Force on moving charges Magnetic Force on moving charges = r r r F qv B 10 20 30 40 50 Avg = 3.0 Avg = 3.0 Confused Confused Confident Confident Todays Plan: Todays Plan: 1) 1) Review of magnetism Review of magnetism 2) 2) Review of cross product Review of cross product 3) 3) Example problem Example problem Key Concepts: Key Concepts: 1) 1) The force on moving charges due to a magnetic field. The force on moving charges due to a magnetic field. 2) 2) The cross product. The cross product. 05 Magnetic Observations N S Bar Magnets Compass Needles S N N S N S N S N S N S cut in half 07 N S Magnetic Charge? Compass needle deflected by electric current I Magnetic fields created by electric currents Magnetic fields exert forces on electric currents (charges in motion) V V I I F F V V I I F F Magnetic Observations 12 Magnetism & Moving Charges All observations are explained by two simple equations: = r r r F qv B Today 2 4 = r r I ds r dB r Next Week 14 Cross Product Review Cross Product different from Dot Product A B is a scalar; A x B is a vector A B proportional to the component of B parallel to A A x B proportional to the component of B perpendicular to A Definition of A x B Magnitude: ABsin Direction : perpendicular to plane defined by A and B with sense given by right-hand-rule 16 Remembering Directions: The Right Hand Rule F qv B = r r r x y z B F qv 17 Three points are arranged in a uniform magnetic field. The B field points into the screen. 1) A positively charged particle is located at point A and is stationary. The direction of the magnetic force on the particle is: Preflight 2 F qv B = r r r The particles velocity is zero. The particles velocity is zero. There can be no magnetic force. There can be no magnetic force. 10 20 30 40 50 18 Three points are arranged in a uniform magnetic field. The B field points into the screen....
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This note was uploaded on 03/05/2011 for the course PHYS 212 taught by Professor Kim during the Spring '08 term at University of Illinois, Urbana Champaign.

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Lect12 - Physics 212 Physics 212 Lecture 12 Lecture 12...

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