For charges A,B,C and D are plasced at the four corners of a squre of a side a. The energy required to take the charges C and D to infinity (they are also infinitely separated from each other )is A. `q^2/(4piepsilon_0a)`B. `(2q^2)/(piepsilon_0a)`C. `q^2/(4piepsilon_0a)(sqrt2+1)`D. `q^2/(4piepsilon_0a)(sqrt2-1)`

For charges A,B,C and D are plasced at the four corners of a squre of

1.	For charges A,B,C and D are plasced at the four corners of a squre of a side a. The energy required to take the charges C and D to infinity (they are also infinitely separated from each other )is A. `q^2/(4piepsilon_0a)`B. `(2q^2)/(piepsilon_0a)`C. `q^2/(4piepsilon_0a)(sqrt2+1)`D. `q^2/(4piepsilon_0a)(sqrt2-1)`
Answer» Correct Answer - C Energy, required `=/_U=U_f-U_i` `=1/(4piepsilon_0)[(q^2/a)-(q^2/a-q/(sqrt2a)-q^2/a-q^2/a-q^1/(sqrt2a)+q^2/a)]` `q^2=(4piepsilon_0)[sqrt2+1]`

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