1.

The electric field intensity produced by the radiations coming from 100W bulb at a 3m distanceis E. The electric field intensity produced by the radiations coming from 50W bulb at the same distance is…….

Answer»

`E/2`
2E
`E/sqrt2`
`sqrt2 E`

SOLUTION :`I=P/A=P/(4pir^2)`
`therefore I prop P` (Here R is constant)
`therefore I_1/I_2=P_1/P_2 IMPLIES E_1/E_2=100/50 implies I_2=E/2`


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