2.A spherical shell of a van de graff generator is to be charged to potential of 2 million volt.
calculate the minimum radius the shell can have ,if the dielectric strength of air is 0.8 kv/mm

Question

2.A spherical shell of a van de graff generator is to be charged to potential of 2 million volt.
calculate the minimum radius  the shell can have ,if the dielectric strength of air is 0.8 kv/mm

anonymous · Answer

find the potential difference first

anonymous · Answer

i got the answer that w=v/q. if v=0 then it means w=0

souvik · Answer

good job..you are right

anonymous · Answer

The electric field intensity at the surface of a uniformly charged spherical surface is $$E=\frac{ 1 }{ 4\pi \epsilon _{0} }\frac{ Q }{ r ^{2} }$$ 

The potential of a uni formally charged spherical surface is
$$V=\frac{ 1 }{ 4\pi \epsilon _{0}}\frac{ Q }{ r }$$

Use the given information to find r.