Why does having metal in microwaves cause sparks if the ovens are made of metal?

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Why does having metal in microwaves cause sparks if the ovens are made of metal?

2007-12-08 14:19:56 · 3 answers · asked by Baby Jack born 4/5/09 4 in Science & Mathematics ➔ Physics

3 answers

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2007-12-08 14:38:45 · answer #1 · answered by maram 4 · 0⤊ 0⤋

The interior of the microwave is a TUNED CAVITY.

Adding metal grossly DETUNES it and causes the energy inside to discharge as sparks.

The moisture in the objects detune the cavity and the energy is discharged into a larger, more even area that contains the moisture.

2007-12-08 14:31:10 · answer #2 · answered by Anonymous · 0⤊ 0⤋

Voltage builds up on the conductors due to the the high electric field of the microwave radiation. This breaks down (ionizes) the air.

2007-12-08 15:10:21 · answer #3 · answered by Dr. R 7 · 0⤊ 0⤋