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Ask experts Expert Question: Four charge +q , - q , +q , -q , are plaed at the four corner of the square having side "a" .How muc
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[Post New] 2 Jul 2009 12:20:23 IST
   Subject: Four charge +q , - q , +q , -q , are plaed at the four corner of the square having side "a" .How
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Chanchal (5)

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Four charge +q , - q , +q , -q , are plaed at the four corner of the square having side "a" .How much work is done to remove the charges to infinity ?
    

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[Post New] 2 Jul 2009 14:48:35 IST
   Subject: Four charge +q , - q , +q , -q , are plaed at the four corner of the square having side
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νιѕнαℓ (203)

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Sorry, I answered it wrong.

I just rechecked things and the answer should be something like this

Calculate all the possible pairs of potentials between the charges. That will be your answer.
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[Post New] 2 Jul 2009 17:38:10 IST
   Subject: Four charge +q , - q , +q , -q , are plaed at the four corner of the square having side
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Anubhav (173)

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wats the answer???

IS it 

    

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[Post New] 8 Jul 2009 11:51:11 IST
   Subject: Four charge +q , - q , +q , -q , are plaed at the four corner of the square having side
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edison (8935)

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Work done to remove the charges to infinity  =  Potential energy of the system (that comprises of four charges)

 

Potential energy = U = kq[-q/a + q/a. root2 + -q/a] - kq (q/a -q/a. root2) + kq ( -q/a)

 

or U = kq[-2q/a + 2q/a. root2 + -2q/a]

 

or U = - 4kq2/a + root(2) kq2/a
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