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Lecture19 - Physics 132 Introductory Physics Electricity...

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1 February 20, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 1 Physics 132 Introductory Physics: Electricity and Magnetism Winter Quarter 2008 Lecture 19 February 20, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 2 Fields, Charges, and Field Lines Electric charges create electric fields. (Gauss’ Law) Electric field lines begin on + charges and end on - charges. Like charges repel, opposites attract. Start with same idea for magnetic fields Magnetic field lines begin on North(+) poles and end on South(-) poles. Like poles repel, opposites attract. Important difference: N & S poles always occur together! No magnetic monopoles (isolated magnetic charges) Basic element of sources of magnetic field is the magnetic dipole.
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2 February 20, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 3 Magnetic Fields and Electric Charges Force due to electric field: F = q E But there are no equivalent magnetic charges g: F = g B Do magnetic fields accelerate electric charges? Yes! But only on moving electric charges. Experimentally: F = q v × B Units of B are: Tesla = Ns mC B = F qv February 20, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 4 Vector Cross Product and Right Hand Rule Often we’ll need to do c = a × b Properties of the Cross Product: 1) c is perpendicular to a and b . 2) Right-hand rule : If the fingers of your right hand curl from a to b , c will be along the direction of your thumb.
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