Electrostatic repulsion in a charged ring

Consider a homogeneous ring of radius RR made of a thin wire of cross section AA (R2AR^{2} \gg A ). A Charge Q1=10μCQ_{1}=10\mu\mbox{C} , uniformly distributed over the ring, broke it apart due to electrostatic repulsion. An engineer decides to design a ring (with the same dimensions) made of a material 10 times more resistant. What minimum charge Q2Q_{2} in μC\mu \mbox{C} breaks the new ring?

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