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Unformatted text preview: Craig Ogilvie Craig Ogilvie 11 Review Lecture 15 Â§ Concept of a field, a vector that exists at all points in space Â§ Bfield is operationally defined by the magnetic force on a B , v vB q F F B v q F between angle sin     Ï• Ï• = = Ã— = Â§ Force is zero if & v is parallel to D B Â§ Force is zero if v = 0 Â§ Bfield lines are continuous loops Â§ No magnetic monopoles Â§ Bfields are made by moving charges, next week Craig Ogilvie Goals for Today Â§ Charged particleâ€™s motion in uniform Bfield Â§ Force on currentcarrying wire Craig Ogilvie 22 Craig Ogilvie Craig Ogilvie 33 Constant Speed, Circular Motion Â§ Acceleration changes direction of & v uniform& B in all this region If v is perpendicular to B Then charged particle moves in circle In prelecture video, derived radius R: qB mv R = Craig Ogilvie Craig Ogilvie 44 Question: Circular Motion 1st round 1) stays the same 2) increases by factor of two 3) decreases by factor of two 4) not enough information C v, q>0 R b F uniform & B in all this region Â§ If you double the magnetic field, keeping all other quantities the same, then radius of the circular orbit 1 of 300 Craig Ogilvie...
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 Spring '07
 Johnson
 Physics, Charge, Force, Magnetic Field, Craig Ogilvie

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