Uniformly charged solid nonconducting sphere (insulator) (Inside E ∝ r; outside E=kQ/r²)

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Inside E ∝ r; outside E=kQ/r²

What each symbol means

SymbolWhat it stands for
QTotal charge
RRadius
rDistance from centre

When to use this

Uniform volume charge density ρ = 3Q/(4πR³).