- Lim (1+2^2+3^2+...+n^2)/n^3 as n goes to infinity.?

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Two identical spheres experience charge F. Each lose 1/4 of initial charge. What is the electrostatic force on each one. Distance = constant? How big or small are the proton beams of synchrotron? Let f(x) = |x|. Solve f(x) < 3/2? What is the Balance: No2+H2O=HNO3? How the effective distance is calculated here ?