15 Bfield - Craig Ogilvie Review Lecture 14 Series circuits...

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Unformatted text preview: Craig Ogilvie Review Lecture 14 Series circuits with capacitors Takes time to build up the charge on the capacitor Time constant =RC Craig Ogilvie 11 ) 1 ( ) ( RC t final e Q t q-- = RC t e Q t q / ) (- = Craig Ogilvie Craig Ogilvie 22 Magnetic (B) Field: Build from basics This week Magnetic force experienced by a single moving charge in a pre-existing B-field Next week How to create a B-field from a moving charge Few weeks time Interaction between two current loops Reason why compass points north Craig Ogilvie Craig Ogilvie 33 Magnetic Field For now we will assume we can create a B-field using a magnet today, study the force it exerts on charged particles B-field at every point, there is a vector B that has a particular magnitude and direction B-field extends to all points in space Demo to visualize this B-field Craig Ogilvie Craig Ogilvie 44 B-field from magnet B-field is continuous, field lines are loops , no beginning/end There is nothing so special about location of pole where the material ends, field is 90o Convention, direction of B-field: leaves N-pole At a microscopic level, this B-field is created by motion of...
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15 Bfield - Craig Ogilvie Review Lecture 14 Series circuits...

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