A lamp radiates power P(0) uniformly in ...

A lamp radiates power `P_(0)` uniformly in all directions, the amplitude of elctric field strength `E_(0)` at a distance `r` from it is

`E_(0) = (P_(0))/(2 pi epsilon_(0) cr^(2))`

`E_(0) = sqrt((P_(0))/(2 pi epsilon_(0) cr^(2)))`

`E_(0) = sqrt((P_(0))/(4 pi epsilon_(0) cr^(2)))`

`E_(0) = sqrt((P_(0))/(8 pi epsilon_(0) cr^(2)))`

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