WHY IS GAUSS LAW VALID IN VACUUM ONLY???????

SEE, I DONT THINK ITS ONLY VALID IN VACUUM. ITS JUST THT WE HAVE DERIVED IT IN VACUUM. NOW WHEN I WENT THROUGH THE PROCEDURE AND UR CONDITION OF ANY MEDIUM OTHER THAN VACUUM , I GOT TO THE CONCLUSION THT WE MAY APPLY IT FOR ANY OTHER MEDIUM MAKING A SLIGHT MODIFICATION IN GAUSS LAW. AS FAR AS I GOT IT, WE MAY USE THE EQUATION

 

where  is relative permittivity of the medium. WELL I GOT IT USING MY METHOD OF DERIVATION AND WOULD REALLY LIKE OTHERS TO VERIFY AND LET ME KNOW WHETHER IT IS RIGHT OR NOT. AS FAR AS I THINK IT SHOULD BE LIKE THIS.

RATE IF SATISFIED.

gauss's law can also be applied in other medium's too,i think the equationn will modified to

Gauss's law can be applied for all mediums.

there is a slight change in the equation-it becomes-

electric flux=    charge enclosed / dielectric const.of medium * dielectric const. of vacuum