Question

The electric field intensity produced by the radiations coming from 100W bulbs at a 3m distance is E. The electric field intensity produced by the radiations coming from 50W bulb at the same distance is
A. `E/2`
B. `2E`
C. `E/(sqrt(2))`
D. `sqrt(2)E`

Answer 1

Correct Answer - C
We know that, `E_(0) prop sqrt(P_(av))`
`:. ((E_(0))_(1))/((E_(0))_(2)) = sqrt(((P_(av))_(1))/(P_(av))_(2))`
`rArr (E)/((E_(0))_(2)) = sqrt((100)/(50))`
`(E_(0))_(2) = e//sqrt(2)`