lect08_handout - Physics 102: Lecture 08 Magnetism This...

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Physics 102: Lecture 8, Slide 1 Magnetism Physics 102: Lecture 08 This material is NOT on exam 1!
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Physics 102: Lecture 8, Slide 2 Lecture Overview Magnetic fields Magnetic forces on moving charges Direction: “Right hand rule” Magnitude
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Physics 102: Lecture 8, Slide 3 North Pole and South Pole Opposites Attract Likes Repel Magnetic Field B Units = Tesla (T) Like E, vector at a location Points N to S N S Magnetic Field Lines Arrows give direction Density gives strength Looks like dipole!
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Physics 102: Lecture 8, Slide 4 The Earth is a Magnet
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Physics 102: Lecture 8, Slide 5 No Magnetic Charges N and S poles always go together 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) We’ll return to this in Lecture 25 & 26
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Physics 102: Lecture 8, Slide 6 Magnetic Fields and Forces Magnetic field B exerts force on moving charge M a g n i t u d e D r c o ? = ? ? ? sin ? Magnetic force is perpendicular to both B and v “Right-hand rule” (RHR): Thumb of right hand along v Fingers of right hand along B Out-of-palm points in the direction of F for + charge opposite to F for – charge Note: there are different versions of RHR
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Physics 102: Lecture 8, Slide 7 ACT: Direction of Magnetic
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lect08_handout - Physics 102: Lecture 08 Magnetism This...

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