lecture08 - Physics 102: Lecture 08 Exam I, Monday, Feb. 22...

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Exam I, Monday, Feb. 22 What will exam cover? Lectures through #7 (RC circuits) Homework through #3 Discussions through #3 Labs through #3 Review, Sunday, Feb. 21, 3 PM, 141 Loomis I will go over old exam problems Physics 102: Lecture 08
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Today’s Lecture: Magnetism This material is NOT on exam 1 Magnetic fields Magnetic force on charged particles
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Magnets + - North Pole and South Pole Opposites Attract Likes Repel Magnetic Field Lines Arrows give direction Density gives strength Looks like dipole! 15 N S
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The Earth is a Magnet Magnetoreception Magnetotactic bacteria
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No Magnetic Charges Magnetic Fields are created by moving electric charge! Where is the moving charge? Orbits of electrons about nuclei Intrinsic “spin” of electrons (more important effect) 21
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Magnetic Fields and Forces Magnetic fields exert forces on moving charge We will discuss the magnitude of the force shortly Direction of force is given by a “right-hand rule”
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Direction of Magnetic Force on Moving Charges 25 Magnetic force is perpendicular to both B and v Right-hand rule: Point thumb of right hand in v direction Point fingers of right hand in B direction Then out-of-palm points in the direction of F for + charge opposite to F for – charge Note: different versions by different books etc. 25
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Direction of Magnetic Force on Moving Charges Velocity B Force out of page right up out of page left down 25 ACT: 1) Up 2) Down 3) Right 4) Left 5) Zero out of page up
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Moving Charges
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This note was uploaded on 01/25/2012 for the course PHYS 102 taught by Professor Lee during the Spring '08 term at University of Illinois, Urbana Champaign.

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lecture08 - Physics 102: Lecture 08 Exam I, Monday, Feb. 22...

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