So, we have
"q=\\Delta V\\cdot\\rho=(\\frac{4}{3}\\pi r_2^3-\\frac{4}{3}\\pi r_1^3)\\cdot \\rho=\\frac{4}{3}\\pi (r_2^3-r_1^3)\\cdot \\rho="
"=\\frac{4}{3}\\cdot 3.14\\cdot (0.045^3-0.037^3)\\cdot 6.1\\cdot10^{-4}=1.67\\cdot10^{-6}C=1.67" "\\mu C"
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