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H31 De vergelijkingen van Maxwellen Elektromagnetische golven
verplaatsingsstroom Er is een ambiguïteit met ‘het oppervlak dat door de lijn omsloten wordt’ in de wet van Ampère.  4/17/2010 2 H31 Elektromagnetische golven
verplaatsingsstroom Dit is geen probleem voor tijdsonafhankelijke stromen (wegens behoud van lading), maar wel voor tijdsafhankelijke stromen! 4/17/2010 H31 Elektromagnetische golven 3
verplaatsingsstroom 4/17/2010 H31 Elektromagnetische golven 4 Maxwell’s verplaatsingsstroom
een condensator laden… 4/17/2010 H31 Elektromagnetische golven 5
een condensator laden… 4/17/2010 H31 Elektromagnetische golven 6
wet van Gauss voor het MV Magnetische veldlijnen zijn gesloten lijnen magnetische monopolen bestaan niet 4/17/2010 H31 Elektromagnetische golven 7
wetten van Maxwell 4/17/2010 H31 Elektromagnetische golven 8
wetten van Maxwell 4/17/2010 H31 Elektromagnetische golven 9 Als er diëlektrische of magnetische materialen aanwezig zijn
wetten van Maxwell 4/17/2010 H31 Elektromagnetische golven 10 In differentiële vorm
vgl van Maxwell in de  vrije ruimte 4/17/2010 H31 Elektromagnetische golven 11 !
vgl van Maxwell in de  vrije ruimte 4/17/2010 H31 Elektromagnetische golven 12 !
elektromagnetische golven 4/17/2010 H31 Elektromagnetische golven 13 ! c = 2.998 108 m/s
elektromagnetische golven 4/17/2010 H31 Elektromagnetische golven 14 ! monochromatisch golfgetal (m-1) amplitude (V/m) cirkelfrequentie (s-1 of Hz) fasesnelheid (m/s) merk op: c() niet- dispersief golflengte (m) frequentie (Hz) mei 2008 14
elektromagnetische golven 4/17/2010 H31 Elektromagnetische golven 15 ! mei 2008 15
elektromagnetische golven 4/17/2010 H31 Elektromagnetische golven 16 ! rechtsdraaiend mei 2008 16
elektromagnetisch spectrum 4/17/2010 H31 Elektromagnetische golven 17
Elektromagnetische golven in een isolator 4/17/2010 H31 Elektromagnetische golven 18 ! brekingsindex dispersief regenboogeffect
Poynting vector 4/17/2010 H31 Elektromagnetische golven 19 De energiestroom per tijdseenheid en per oppervlakte-eenheid is de Poyntingvector (=intensiteit in akoestiek).
Poynting vector 4/17/2010 H31 Elektromagnetische golven 20
Stralingsdruk 4/17/2010 H31 Elektromagnetische golven 21

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H31 elektromagnetische golven