# Unit22b - Displacement Current.pdf - Physics 240 Fall 2017...

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Physics 240 Fall 2017Unit 22Displacement Current andElectromagnetic WavesPhysics 240Unit 22, Slide 1Prof. David Gerdes[email protected]Office hours: Tu 1-3pm in thePhysics Help Room
Countdown to end of semesterPhysics 240Unit 20, Slide 2Quiz 6Final Exam7:30-9:30pmLocation TBA
dAmpere-Maxwell Law:There are twosources of magnetic field:Currents (moving charges)Changing electric fields(displacement current)Both sources make B-field lines that“curl” into closed loops.Note the appearance ofA big clue!m0e0=1/c2
dtEdJandEJnoteAdJJIIldBDcboundedsurfanyDcDcpath1:)()(00Displacement “Current”(not actual charge flow)E flux,ΦEis spread out overthe plate area.Iciscontained to the wireQuestion:How does Binsidethe capacitordepend on r?(r<R)A. ~rB. ~r2C. ~1/rD. ~1/r2
IThe diagram depicts a conduction currentIcharging a parallel plate capacitor.Consider the contour (solid circle) drawn inside of the capacitor.Two surfaces bounded by the contour are shown, the dashed line surface andthe shaded surface.How is the displacement currentthrough theshaded surfacerelated tothe conduction current in the wire?

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Term
Fall
Professor
DaveWinn
Tags
Magnetic Field, Electric charge