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16 BForces - Craig Ogilvie Craig Ogilvie 11 Review Lecture...

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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 § B-field is operationally defined by the magnetic force on a B , v vB q F F B v q F between angle sin | | | | ϕ ϕ = = × = § Force is zero if & v is parallel to D B § Force is zero if v = 0 § B-field lines are continuous loops § No magnetic monopoles § B-fields are made by moving charges, next week Craig Ogilvie Goals for Today § Charged particle’s motion in uniform B-field § Force on current-carrying 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 pre-lecture 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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16 BForces - Craig Ogilvie Craig Ogilvie 11 Review Lecture...

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