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F=Gm1m2r2F = \frac{Gm_1m_2}{r^2}F=r2Gm1m2
F=Q1Q24πε0r2F = \frac{Q_1Q_2}{4\pi\varepsilon_0 r^2}F=4πε0r2Q1Q2
Always attractive
Attractive (opposite charges) or repulsive (like charges)
Force per unit mass
Force per unit charge
V=−GMrV = -\frac{GM}{r}V=−rGM
V=Q4πε0rV = \frac{Q}{4\pi\varepsilon_0 r}V=4πε0rQ
g=−ΔVΔrg = -\frac{\Delta V}{\Delta r}g=−ΔrΔV or E=−ΔVΔrE = -\frac{\Delta V}{\Delta r}E=−ΔrΔV
Grav: independent; Electric: affected by permittivity
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