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102lect08_handout - Physics 102 Lecture 8 Slide 1 Magnetism...

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Unformatted text preview: Physics 102: Lecture 8, Slide 1 Magnetism Physics 102: Lecture 08 This material is NOT on exam 1! Physics 102: Lecture 8, Slide 2 Lecture Overview • Magnetic fields • Magnetic forces on moving charges – Direction: “Right hand rule” – Magnitude Physics 102: Lecture 8, Slide 3 Magnets & magnetic fields • 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 • Magnetic Field Lines – Arrows give direction – Density gives strength – Looks like dipole! Physics 102: Lecture 8, Slide 4 The Earth is a Magnet 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 Physics 102: Lecture 8, Slide 6 Magnetic Fields and Forces • Magnetic field B exerts force on moving charge • 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 Physics 102: Lecture 8, Slide 7 ACT: Direction of Magnetic Force on + Moving Charge Velocity B...
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102lect08_handout - Physics 102 Lecture 8 Slide 1 Magnetism...

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