Q 3212401330.     Three point charges of `+ 2 mu C, -3 mu C` and `-3 mu C` are kept at the vertices A, B and C respectively of an equilateral triangle of side `20 cm` as shown in the figure. What should be the sign and magnitude of the charge to be placed at the mid-point (M) of side `BC` so that the charge at `A` remains in equilibrium ?

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