# What does the expression reduce to if we move so far away along the central axis that ?

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What does the expression reduce to if we move P so far away along the central axis that z > R?

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- NCSLv 73 months agoFavorite Answer
For z >> R,

E = qz / [4πε₀*(z²+R²)^(3/2)] ≈ qz / [4πε₀*(z²)^(3/2)] = qz / [4πε₀*z³] = q / [4πε₀*z²]

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- MarkLv 73 months ago
You get an asymptote (a place where a function doesn't exist, in this case, because you'd be dividing by zero).

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what would the formula look like? or is it just 0?