Class12OK

Class12OK - Electromagnetic Waves Electromagnetic waves (EM...

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Unformatted text preview: Electromagnetic Waves Electromagnetic waves (EM wave): it is characterized by time varying electric field and magnetic induction (field) . In EM waves, these two fields are interdependent to each other. B r E r Maxwells Equations and = = = = J o o r Maxwells Equations: in free space Integral form Differential form S d t B l d E C A r r r r = t B E = r r (35b) (35a) t E B o o = r r S d t E l d B C A o o r r r r = (36b) (36a) = A S d E r r = B r (37b) (37a) = A S d B r r = E r (38b) (38a) Electromagnetic Waves Electromagnetic waves (EM wave): it is characterized by time varying electric field and magnetic induction (field) . In EM waves, these two fields are interdependent to each other. B r E r E r field is generated by both electric charges and the time-varying magnetic field B r field is generated by both electric current and the time-varying electric field Basic Laws of Electromagnetic Theory: summaries the relationship between electric and magnetic field, and their relevance to the sources (electric charge and current) Flux (Fig. 3.3&3.4): flux of magnetic field through an area: Divergence of : Curl of : S d B A B A m r r = = cos E r E r z E y E x E E z y x + + = r + =...
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Class12OK - Electromagnetic Waves Electromagnetic waves (EM...

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