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Engineering

Physics

Physical Quantities

Question

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$\frac{ρ}{4 π} (\frac{1}{a} + \frac{1}{b})$

$\frac{ρ}{4 π} (\frac{1}{a} - \frac{1}{b})$

$\frac{ρ}{2 π} (\frac{1}{a} - \frac{1}{b})$

$\frac{ρ}{2 π} (\frac{1}{a} + \frac{1}{b})$

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$R = \int_{a}^{b} \frac{ρdx}{4 {πx}^{2}}$

$= \frac{ρ}{4 π} (\frac{1}{a} - \frac{1}{b})$