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Re: Glass loss question



Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

uhhhh...

Where there is a changing magnetic (electric) field there is a changing
electric(magnetic) field.  The ratio between the two fields is the impedance
(377 ohms for free space)...

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, November 27, 2001 11:51 AM
Subject: Re: Glass loss question


> Original poster: "Jason Petrou by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<jasonp-at-btinternet-dot-com>
>
> Luc,
>
> >Could someone explain me why
> > glass is so little heated by microwave. May be get disturb by an
> > electric field between 2 conductor plate and be cross by
> > electromagnetic field have not the same effect on dielectric ????
> > or the loss are there only in a range of frequency????
> Basically, microwave magnetrons are 'tuned' to operate at the resonant
> frequency of water molecules, which allows microwaves to heat up water
based
> substances. The reason that the glass doesnt get hot is because mcuh of
the
> energy is absorbed by a microwave. In a microwave the potential difference
> between the food and the dielectric is essentially nothing. However, if
you
> put some alu foil in the glass and turn on the microwave then you will
> probably kill the microwave and the glass would be very hot.
>
> Microwaves produce an electromagnetic rather than a magnetic or electric
> field, and to convert to an electric field you need metal...
>
> Best Regards,
> Jason
>
>
>