[Hamid]

Why some times electromagnetic waves prefer to remain on wire and conductors in form of voltage and current and sometimes fly to space in form of light and electromagnetic radiations?

Why some times electromagnetic waves prefer to remain on wire and conductors in form of voltage and current and sometimes fly to space in form of light and electromagnetic radiations?

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[Hamid]

If we allow the voltage source across a wire to slowly oscillate in time at frequency, f₀, the accompanying electric field will take the same form as that of the DC charge, except that the magnitude will vary between positive and negative values (see Figure). Relating frequency to wavelength by ? = c/f, we define

[نویسنده]

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