Principle of Millikan’s determination of the electronic charge, e (AQA A-Level Physics): Quizzes

To determine the charge of an electron

By friction

Uniform electric field

$E = \frac{V}{d}$

$\frac{QV}{d} = mg$

The droplet falls due to gravity

$F = 6\pi\eta rv$

Gravitational and viscous drag

$r = \sqrt{\frac{9\eta v}{2\rho g}}$

Multiples of $1.6 \times 10^{-19}$ C