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Electricity

Hot goIITian

 Joined: 9 Apr 2007 Post: 146
9 Jan 2010 11:36:12 IST
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a charge Q is uniformly distributed on a plastic plate .the electric field at point p neat the cente
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a charge Q is uniformly distributed on a plastic plate .the electric field at point p neat the center of the plate is 10 v/m .if this plate is replaced by copper plate of same dimension and charge ,the electric field at the point p will become a) zero b)10 v/m c)20 v/m

Cool goIITian

Joined: 25 Dec 2009
Posts: 65
9 Jan 2010 11:55:07 IST
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10 v/m , field will remain same !!!

Forum Expert
Joined: 19 Feb 2009
Posts: 1979
9 Jan 2010 11:58:59 IST
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Inside the conductor EF is zero.............for the case of plastic we have 10V/m...........but for conductor at the center inside it EF=0

Cool goIITian

Joined: 25 Dec 2009
Posts: 65
9 Jan 2010 12:02:47 IST
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Forum Expert
Joined: 19 Feb 2009
Posts: 1979
9 Jan 2010 12:06:02 IST
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you are right/.

Cool goIITian

Joined: 25 Dec 2009
Posts: 65
9 Jan 2010 12:08:13 IST
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sir , the net charge on the plate should be Q ??? isn't it ??

And u r making the total charge as zero !!!???

+q - q =0 ??

Hot goIITian

Joined: 9 Apr 2007
Posts: 146
9 Jan 2010 19:33:34 IST
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its abt a point outside the plate

Hot goIITian

Joined: 9 Apr 2007
Posts: 146
9 Jan 2010 19:37:48 IST
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copper is a conductor..whereas plastic is an insulator..so electric field near a charged conductor is sigma/epsilon..whereas for an insulatror it is sigma /2*epsilon

Cool goIITian

Joined: 25 Dec 2009
Posts: 65
9 Jan 2010 19:43:54 IST
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here sigma is also changing !!!!! so i think field will remain same ! 10v/m ! isn't it ??

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