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Thermal Physics

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22 May 2012 13:12:45 IST

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why does an electric field inside a dielectric decrease when it is placedin an external field?

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Aman Raghuvanshi

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25 May 2012 17:24:57 IST

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This is because the dielectric reduces the nunber of electric field lines passing through it by acting as a neutral wall.

It is like the intensity of sound heard reduces if a large obstacle (or wall) is placed b/w the source and observer (the diff is that the wall reflects back sound waves but dielectric doesn't reflect or absorb the field lines).

P.S. : I am no expert but this ^ is what i conclude.

Janardhan K

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25 May 2012 17:34:16 IST

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i think u need to renovate ur question.

Janardhan K

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25 May 2012 17:36:06 IST

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the overall electric field decreases because of the development of opp. but parallel electric field inside the dielectric.

Aman Raghuvanshi

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26 May 2012 21:03:49 IST

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@ Janardhan K

Please explain what you wrote...how does that happen??

Janardhan K

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27 May 2012 17:24:36 IST

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i wrote that because in absence of external field there is no "electric field inside a dielectric".when ext. field is applied it gets polarized and then the electric field gets created "inside the dielectric".

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