Thermal Physics

Cool goIITian

Joined: 28 Jan 2012
Post: 84
22 May 2012 13:12:45 IST
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electrostatics
Engineering Entrance , Medical Entrance , NEET , JEE Main , AIIMS , JEE Main & Advanced , Physics , Thermal Physics

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

 



Comments (5)


Hot goIITian

Joined: 13 Nov 2011
Posts: 157
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.


Blazing goIITian

Joined: 16 May 2012
Posts: 1495
25 May 2012 17:34:16 IST
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i think u need to renovate ur question.

Blazing goIITian

Joined: 16 May 2012
Posts: 1495
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.

Hot goIITian

Joined: 13 Nov 2011
Posts: 157
26 May 2012 21:03:49 IST
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 @  Janardhan K

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

 


Blazing goIITian

Joined: 16 May 2012
Posts: 1495
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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