1.

The maximum surface charge density of a uniformly charged spherical radius R and wall thickness 't', so that it will not burst apart, is

Answer»

`SQRT((sigma_m epsilon_0 t)/R)`
`sqrt((2sigma_m epsilon_0 t)/R)`
`sqrt((3sigma_m epsilon_0 t)/R)`
`sqrt((4sigma_m epsilon_0 t)/R)`

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