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Coulomb’s law

at each of the four corners of a sqare of side A, a charge +q is placed freely. what charge should be placed at the centre of the sqare so that whole  system be in equilibrium

 

Asked Shashank

http://www.meritnation.com/ask-answer/question/at-each-of-the-four-corners-of-a-square-of-side-a-a-charge/electric-charges-and-fields/9139189

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