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[" (Ans."6.27times10^(-7)J)],[" Positive...

[" (Ans."6.27times10^(-7)J)],[" Positive charges of "6,12" and "24nC" are placed at the "],[" three vertices of a square.What charge must be "],[" placed at the fourth vertex so that total potential at "],[" the centre of the square is zero? (Ans.- "A'" the "],[" Two equal charges,"2.0times10^(-7)C" each are "h]

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