Calculate the root mean square value of electric field produced by the radiation from 100W bulb at a distanece 1m. Assume bulb as point source and its efficiency is 2%.

Explanation

`t=(2)/(100)xx(100)/((4pir^(2)))`
`l=0.16xx("watt")/(m^(2))`
`l=epsi_(0)E_(ms)^(2)xxc`
`=sqrt((0.16)/(8.85xx10^(-13)xx3xx10^(8)))`
`E_(ms)=7.76(N)/(C)`