College Physics 10th Edition by Raymond Serway,Chris Vuille

تمرين 70

The metal sphere of a small Van de Graaffgenerator illustrated in Figure 15.23 has a radius of 18 cm. When the electric field at the surface of the sphere reaches 3.0 × 10 6 V/m, the air breaks down, and the generator discharges. What is the maximum potential the sphere can have before breakdown occurs