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

Answer 1

find the potential difference first

Answer 2

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

Answer 3

good job..you are right

Answer 4

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.