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Q.) Three point charges, which initially are infinitely far apart are placed at the corners of an equilateral triangle with sides d. Two of the point charges are identical and have charge q. If zero net work is required to place the three charges at the corners of the triangle, what must be the value of the third charge be? Ans. -q/2

Q.)


Three point charges, which initially are infinitely far apart are placed at the corners of an equilateral triangle with sides d. Two of the point charges are identical and have charge q. If zero net work is required to place the three charges at the corners of the triangle, what must be the value of the third charge be? 


 


Ans. -q/2

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3 Answers

Chetan Mandayam Nayakar
312 Points
11 years ago

let k=4*pi*ε0

let third charge be Q

(1/k)((q2/d)+ (2Qq/d))=0

DHRUBA JYOTI ROY KARMAKAR
11 Points
11 years ago

let,the charge on third charge be Q...

so,calculate the energy of the third charge and equate it to zero

it will give you the charge of d third charge to be -q/2

Abhisek Roy
11 Points
11 years ago

thanks wellwisher

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