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anonymous
 3 years ago
E cross H= Power
Curl(E cross H)=H (curl E) E(Curl H)
H ( dB/dt ) E( J+ dD/dt)
for some reason they say J=0 , I don't get why?
anonymous
 3 years ago
E cross H= Power Curl(E cross H)=H (curl E) E(Curl H) H ( dB/dt ) E( J+ dD/dt) for some reason they say J=0 , I don't get why?

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anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0J depends on what material is used. In free space there are no electric charges, and hence J equals to zero.

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0(same answer as Anonymous1921) If you use this equation with reference to an electromagnetic wave travelling in a vacuum, there is not current there, so J = 0
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