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**Help!A question very difficulty!!**

The question is:

Three identical small spheres of mass m are suspended by threads of negligible masses and equal length L from a common point.Acharge Q is divided equally between the spheres and they come to equilibrium at the coners of a horizontal equilateral triangle whose slides are d.

Prove the following Q²=12x∑mgd³[L²-d²/3]^-1/2.

P/S:No figure given,need draw myself!!Any one know it,pls help me.....