# Electrostatic repulsion in a charged ring

Consider a homogeneous ring of radius $$R$$ made of a thin wire of cross section $$A$$ ($$R^{2} \gg A$$). A Charge $$Q_{1}=10\mu\mbox{C}$$, 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 $$Q_{2}$$ in $$\mu \mbox{C}$$ breaks the new ring?

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