5) The spheuical glabe of the van de Graaff ganecater in Regenen Hall has a nadius of charged until the electric field at the surpce reaches the "dielechric skeength" f airg approlimadely 3x106 N/C. How much charge will be anuthe glabe at this threshold If an electron wiere to, break Lru from a maleule of air near the sunface, hous. fast would it be moving if it were accelerated to oo without suffening any callisims? Assume that. the charge on the globe is negative so that our electron is repelled, Also, if the speed of light 8-1) mc² nather than Źmno? 15 cm. It can be. you find that r exceeds , use the relativistic kinetic energy 15cm

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