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The electric field intensity produced by...

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`

Text Solution

Verified by Experts

The correct Answer is:
A
Electric field intensity on a surface due the incident radiation is
`E = (U)/(At) = (P)/(A) ( :' (U)/(t) = P)`
`:. E prop P` (for the given area of the surface)
`:. (E')/(E) = (P')/(P) = (50)/(100) = (1)/(2)`
`E' = (E)/(2)`
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