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Three point charges of +2muC, -3muC , an...

Three point charges of `+2muC, -3muC` , and `-3muC` are kept at the vertices A, B, and C, respectively of an equilatreral triangle of side 20 cm. what should be the sign and magnitude of the charge (q) to be placed at the midpoint (M) of side BC so that the charge at A remains in equilibrium?

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