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Unformatted text preview: Craig Ogilvie Craig Ogilvie 11 Review Lecture 15 Concept of a field, a vector that exists at all points in space Bfield is operationally defined by the magnetic force on a B , v vB q F F B v q F between angle sin     = = = Force is zero if & v is parallel to D B Force is zero if v = 0 Bfield lines are continuous loops No magnetic monopoles Bfields are made by moving charges, next week Craig Ogilvie Goals for Today Charged particles motion in uniform Bfield Force on currentcarrying wire Craig Ogilvie 22 Craig Ogilvie Craig Ogilvie 33 Constant Speed, Circular Motion 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 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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This note was uploaded on 09/20/2011 for the course PHYS 222 taught by Professor Johnson during the Spring '07 term at Iowa State.
 Spring '07
 Johnson
 Physics, Charge, Force

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