Coulomb's law: extended (AQA A-Level Physics): Flashcards

Interaction between charged objects

Repel each other

Attract each other

Charge redistribution in conductor near charged object

Charge separation in insulator, creates net attraction

$F \propto Q_1Q_2$ and $F \propto \frac{1}{r^2}$

$F = \frac{Q_1Q_2}{4\pi\varepsilon_0 r^2}$

$\varepsilon_0 = 8.85 \times 10^{-12}$ F m$^{-1}$

Spherical charged object treated as point charge at centre

Electrostatic force over $10^{39}$ times larger