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![[Post New]](/templates/default/images/icon_minipost_new.gif) 5 May 2007 20:52:16 IST
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the capacitance of earth is infinity if we take charge =Q/V if we take it as a sphere then capacitance = 4pie e r then it comes out to be 711micro farad how can this be possible
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5 May 2007 20:59:40 IST
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actualy the capacitance of earth is not infinity but the value 711micro farad is a very big quantity of capacitance this potential of earth changes very slightly when we give chage to it that"s why we say that earth"s capacitance is infinity
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5 May 2007 21:02:38 IST
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jesus
711/1000000
is not at all a big value i guess and earth remains at 0 potential and" does not change if we give it charge"
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" I've shed many tears. But after, I realize, why am I crying? No matter how bad it got, it could be worse. No matter how much you think it's not going to be ok, eventually it will be. You just have to let it be."
EXPECT MORE FROM URSELF THAN FRM OTHERS AS EXPECTATION FRM OTHERS HURTS U WHILE FROM UR SELF INSPIRES U A lot |
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5 May 2007 21:04:26 IST
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it is big value anyway who is jezus here? no earth"s potential will change if it get some charge
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5 May 2007 21:09:09 IST
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if u use the formula:
C= A  0
d
you can see how big it is(in the sense how much area is required)
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here's a live img of the sun:
> |
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5 May 2007 21:10:24 IST
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well this formula is invalid for earth bcoz earth is not a parllel plate capacitor
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5 May 2007 21:11:50 IST
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are u sure that the potential will change if yes then every time a thunderstuck there will be some charege stored inside the conducter and till now eareth would become full of charge then it would be better to connect our aplliances to earth and save money
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" I've shed many tears. But after, I realize, why am I crying? No matter how bad it got, it could be worse. No matter how much you think it's not going to be ok, eventually it will be. You just have to let it be."
EXPECT MORE FROM URSELF THAN FRM OTHERS AS EXPECTATION FRM OTHERS HURTS U WHILE FROM UR SELF INSPIRES U A lot |
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5 May 2007 21:14:42 IST
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ya i am sure but the change is so less that it has no use like .001V
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5 May 2007 21:15:08 IST
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i mean change in potential occur but veryyyyyyy small
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5 May 2007 21:30:27 IST
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Hi, I am sorry, but i have a doubt !!! Earth consists mostly of metals. And we know that, for metal objects, capacitance is infinity. Capacitance = 4   *r This formula is for those spheres, which are made of insulating things.
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My birthday is no ordinary day.
Its the day when i declared in my own voice,
I WILL NOT GO QUIETLY INTO THE NIGHT,
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I CELEBRATE MY BIRTHDAY, AS MY INDEPENDENCE DAY !!!!!!!!! |
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5 May 2007 21:34:02 IST
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this formula is valid for conductors like earth
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6 May 2007 11:19:37 IST
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pls what are u talking about the potential changes is going above my head pls go in detail
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" I've shed many tears. But after, I realize, why am I crying? No matter how bad it got, it could be worse. No matter how much you think it's not going to be ok, eventually it will be. You just have to let it be."
EXPECT MORE FROM URSELF THAN FRM OTHERS AS EXPECTATION FRM OTHERS HURTS U WHILE FROM UR SELF INSPIRES U A lot |
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8 Aug 2007 13:09:28 IST
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EARTH AS A SPHERICAL CAPACITOR: Approximate the Earth as a spherical shell with some excess charge ?Q surrounded by another spherical shell with and equal but opposite charge +Q. | Voltage drop between two charged spherical shells: |  |  | Spherical Capacitance........: Earth:
Let R1 = 6,378 km, the radius of the Earth.
Let R2 approach infinity, or simply let R2 >> R1, then
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The inevitable truth of life.....everyone in our life is going 2 hurt sooner or later......u just have 2 realise who is worth.....
the PAIN or the PERSON...!!! |
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8 Aug 2007 14:05:11 IST
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did u get it????????????
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The inevitable truth of life.....everyone in our life is going 2 hurt sooner or later......u just have 2 realise who is worth.....
the PAIN or the PERSON...!!! |
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