What is the charge density on the insulator?

  • Thread starter Luke0034
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Homework Statement



Insulator has a 3 cm radius and is a sphere. It has a total charge of -4.2 uC. I need to find the charge density of the insulator.

Homework Equations


sigma = total charge / volume.... I think?

The Attempt at a Solution



After using the above equation, I got -3.714E-8 C/m

I am just not sure if this is the correct charge density for the insulator. I know that for conductors, I think the equation would be charge/area, but I think since an insulator contains the charge throughout the sphere and not just on the surface, you'd have to use volume correct? I am correct in my answer and thinking?
 

Answers and Replies

  • #2
BvU
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Thinking is good, but I can't see your calculation (telepathic powers lacking) :smile: and the dimension of the answer seems a bit strange to me. Value also.
 

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